| insignificance | (noun) the quality of having little or no significance | - |
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| insistence | (noun) the act of insisting on something | Synonyms: insistency |
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| (noun) continual and persistent demands | Synonyms: insisting |
| (noun) the state of demanding notice or attention | Synonyms: imperativeness, insistency, press, pressure |
| insolence | (noun) an offensive disrespectful impudent act | - |
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| (noun) the trait of being rude and impertinent; inclined to take liberties | Synonyms: cheekiness, crust, freshness, gall, impertinence, impudence |
| insouciance | (noun) the cheerful feeling you have when nothing is troubling you | Synonyms: carefreeness, lightheartedness, lightsomeness |
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| instance | (noun) an item of information that is typical of a class or group | Synonyms: example, illustration, representative |
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| (noun) an occurrence of something | Synonyms: case, example |
| (verb) clarify by giving an example of | Synonyms: exemplify, illustrate |
| insurance | (noun) written contract or certificate of insurance | Synonyms: insurance policy, policy |
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| (noun) promise of reimbursement in the case of loss; paid to people or companies so concerned about hazards that they have made prepayments to an insurance company | - |
| (noun) protection against future loss | Synonyms: indemnity |
| insurgence | (noun) an organized rebellion aimed at overthrowing a constituted government through the use of subversion and armed conflict | Synonyms: insurgency |
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| intelligence | (noun) the operation of gathering information about an enemy | Synonyms: intelligence activity, intelligence operation |
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| (noun) the ability to comprehend; to understand and profit from experience | - |
| (noun) information about recent and important events | Synonyms: news, tidings, word |
| (noun) secret information about an enemy (or potential enemy) | Synonyms: intelligence information |
| (noun) a unit responsible for gathering and interpreting information about an enemy | Synonyms: intelligence agency, intelligence service |
| intemperance | (noun) excess in action and immoderate indulgence of bodily appetites, especially in passion or indulgence | Synonyms: intemperateness, self-indulgence |
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| (noun) consumption of alcoholic drinks | Synonyms: intemperateness |
| (noun) the quality of being intemperate | - |
| interdependence | (noun) a reciprocal relation between interdependent entities (objects or individuals or groups) | Synonyms: interdependency, mutuality |
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| interface | (noun) (chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases) | - |
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| (noun) (computer science) computer circuit consisting of the hardware and associated circuitry that links one device with another (especially a computer and a hard disk drive or other peripherals) | Synonyms: port |
| (noun) the overlap where two theories or phenomena affect each other or have links with each other | - |
| (noun) (computer science) a program that controls a display for the user (usually on a computer monitor) and that allows the user to interact with the system | Synonyms: user interface |
| interference | (noun) the act of hindering or obstructing or impeding | Synonyms: hinderance, hindrance |
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| (noun) (American football) blocking a player's path with your body | - |
| (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, hitch, incumbrance, preventative, preventive |
| (noun) a policy of intervening in the affairs of other countries | Synonyms: intervention |
| (noun) electrical or acoustic activity that can disturb communication | Synonyms: disturbance, noise |
| interlace | (verb) spin, wind, or twist together | Synonyms: enlace, entwine, intertwine, lace, twine |
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| (verb) hold in a locking position | Synonyms: interlock, lock |
| intermittence | (noun) the quality of being intermittent; subject to interruption or periodic stopping | Synonyms: intermittency |
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| interstice | (noun) small opening between things | - |
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| (noun) a small structural space between tissues or parts of an organ | - |
| intolerance | (noun) impatience with annoyances | - |
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| (noun) unwillingness to recognize and respect differences in opinions or beliefs | - |
| intransigence | (noun) the trait of being intransigent; stubbornly refusing to compromise | Synonyms: intransigency |
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| introduce | (verb) be a precursor of | Synonyms: inaugurate, usher in |
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| (verb) place, fit, or thrust (something) into another thing | Synonyms: enclose, inclose, insert, put in, stick in |
| (verb) put before (a body) | - |
| (verb) cause to come to know personally | Synonyms: acquaint, present |
| (verb) furnish with a preface or introduction | Synonyms: precede, preface, premise |
| (verb) bring before the public for the first time, as of an actor, song, etc. | Synonyms: bring out |
| (verb) put or introduce into something | Synonyms: enter, infix, insert |
| (verb) bring something new to an environment | Synonyms: innovate |
| (verb) bring in or establish in a new place or environment | - |
| (verb) bring in a new person or object into a familiar environment | Synonyms: bring in |
| intumesce | (verb) expand abnormally | Synonyms: swell, swell up, tumefy, tumesce |
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| (verb) move upwards in bubbles, as from the effect of heating; also used metaphorically | Synonyms: bubble up |
| intumescence | (noun) the increase in volume of certain substances when they are heated (often accompanied by release of water) | Synonyms: intumescency, swelling |
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| (noun) swelling up with blood or other fluids (as with congestion) | Synonyms: intumescency |
| invariance | (noun) the quality of being resistant to variation | Synonyms: invariability, invariableness |
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| (noun) the nature of a quantity or property or function that remains unchanged when a given transformation is applied to it | - |
| invoice | (noun) an itemized statement of money owed for goods shipped or services rendered | Synonyms: account, bill |
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| (verb) send a bill to | - |
| iridesce | (verb) be iridescent | - |
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| iridescence | (noun) the visual property of something having a milky brightness and a play of colors from the surface | Synonyms: opalescence |
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| irrelevance | (noun) the lack of a relation of something to the matter at hand | Synonyms: irrelevancy |
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| irreverence | (noun) a disrespectful act | Synonyms: violation |
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| (noun) an irreverent mental attitude | - |
| issuance | (noun) the act of providing an item for general use or for official purposes (usually in quantity) | Synonyms: issue, issuing |
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| jaundice | (noun) a rough and bitter manner | Synonyms: acerbity, acrimony, bitterness, tartness, thorniness |
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| (noun) yellowing of the skin and the whites of the eyes caused by an accumulation of bile pigment (bilirubin) in the blood; can be a symptom of gallstones or liver infection or anemia | Synonyms: icterus |
| (verb) affect with, or as if with, jaundice | - |
| (verb) distort adversely | - |
| jounce | (noun) a sudden jarring impact | Synonyms: jar, jolt, shock |
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| (verb) move up and down repeatedly | Synonyms: bounce |
| jubilance | (noun) a feeling of extreme joy | Synonyms: exultation, jubilancy, jubilation |
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| juice | (noun) any of several liquids of the body | Synonyms: succus |
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| (noun) the liquid part that can be extracted from plant or animal tissue by squeezing or cooking | - |
| (noun) electric current | - |
| (noun) energetic vitality | - |
| jurisprudence | (noun) the branch of philosophy concerned with the law and the principles that lead courts to make the decisions they do | Synonyms: law, legal philosophy |
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| (noun) the collection of rules imposed by authority | Synonyms: law |
| justice | (noun) judgment involved in the determination of rights and the assignment of rewards and punishments | - |
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| (noun) the quality of being just or fair | Synonyms: justness |
| (noun) a public official authorized to decide questions brought before a court of justice | Synonyms: judge, jurist |
| juvenescence | (noun) the process of growing into a youth | - |
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| lace | (noun) a delicate decorative fabric woven in an open web of symmetrical patterns | - |
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| (noun) a cord that is drawn through eyelets or around hooks in order to draw together two edges (as of a shoe or garment) | Synonyms: lacing |
| (verb) add alcohol to (beverages) | Synonyms: fortify, spike |
| (verb) draw through eyes or holes | Synonyms: lace up |
| (verb) spin, wind, or twist together | Synonyms: enlace, entwine, interlace, intertwine, twine |
| (verb) do lacework | - |
| (verb) make by braiding or interlacing | Synonyms: braid, plait |
| lance | (noun) a long pointed rod used as a tool or weapon | Synonyms: shaft, spear |
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| (noun) an implement with a shaft and barbed point used for catching fish | Synonyms: fishgig, fizgig, gig, spear |
| (noun) a surgical knife with a pointed double-edged blade; used for punctures and small incisions | Synonyms: lancet |
| (verb) open by piercing with a lancet | - |
| (verb) pierce with a lance, as in a knights' fight | - |
| (verb) move quickly, as if by cutting one's way | - |
| lattice | (noun) framework consisting of an ornamental design made of strips of wood or metal | Synonyms: fretwork, latticework |
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| (noun) small opening (like a window in a door) through which business can be transacted | Synonyms: grille, wicket |
| (noun) an arrangement of points or particles or objects in a regular periodic pattern in 2 or 3 dimensions | - |
| launce | (noun) very small silvery eellike schooling fishes that burrow into sandy beaches | Synonyms: sand eel, sand lance, sand launce |
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| lenience | (noun) lightening a penalty or excusing from a chore by judges or parents or teachers | Synonyms: leniency |
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| (noun) mercifulness as a consequence of being lenient or tolerant | Synonyms: leniency, lenity, mildness |
| (noun) a disposition to yield to the wishes of someone | Synonyms: indulgence, leniency |
| lettuce | (noun) leaves of any of various plants of Lactuca sativa | - |
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| (noun) any of various plants of the genus Lactuca | - |
| (noun) informal terms for money | Synonyms: boodle, bread, cabbage, clams, dinero, dough, gelt, kale, lolly, loot, lucre, moolah, pelf, scratch, shekels, simoleons, sugar, wampum |
| licence | (noun) a legal document giving official permission to do something | Synonyms: license, permit |
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| (noun) freedom to deviate deliberately from normally applicable rules or practices (especially in behavior or speech) | Synonyms: license |
| (noun) excessive freedom; lack of due restraint | Synonyms: license |
| (verb) authorize officially | Synonyms: certify, license |
| licorice | (noun) a black candy flavored with the dried root of the licorice plant | Synonyms: liquorice |
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| (noun) deep-rooted coarse-textured plant native to the Mediterranean region having blue flowers and pinnately compound leaves; widely cultivated in Europe for its long thick sweet roots | Synonyms: Glycyrrhiza glabra, liquorice |
| liquorice | (noun) a black candy flavored with the dried root of the licorice plant | Synonyms: licorice |
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| (noun) deep-rooted coarse-textured plant native to the Mediterranean region having blue flowers and pinnately compound leaves; widely cultivated in Europe for its long thick sweet roots | Synonyms: Glycyrrhiza glabra, licorice |
| luminance | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminosity, luminousness |
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| luminesce | (verb) be or become luminescent; exhibit luminescence | - |
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| luminescence | (noun) light from nonthermal sources | Synonyms: glow |
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| (noun) light not due to incandescence; occurs at low temperatures | - |
| luxuriance | (noun) the property of being lush and abundant and a pleasure to the senses | Synonyms: lushness, voluptuousness |
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| mace | (noun) a ceremonial staff carried as a symbol of office or authority | - |
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| (noun) spice made from the dried fleshy covering of the nutmeg seed | - |
| (noun) an official who carries a mace of office | Synonyms: macebearer, macer |
| magnificence | (noun) the quality of being magnificent or splendid or grand | Synonyms: brilliance, grandeur, grandness, splendor, splendour |
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| (noun) splendid or imposing in size or appearance | Synonyms: grandness, impressiveness, richness |
| magniloquence | (noun) high-flown style; excessive use of verbal ornamentation | Synonyms: grandiloquence, grandiosity, ornateness, rhetoric |
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| maintenance | (noun) activity involved in maintaining something in good working order | Synonyms: care, upkeep |
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| (noun) the act of sustaining life by food or providing a means of subsistence | Synonyms: sustainment, sustenance, sustentation, upkeep |
| (noun) the unauthorized interference in a legal action by a person having no interest in it (as by helping one party with money or otherwise to continue the action) so as to obstruct justice or promote unnecessary litigation or unsettle the peace of the community | Synonyms: criminal maintenance |
| (noun) means of maintenance of a family or group | - |
| (noun) court-ordered support paid by one spouse to another after they are separated | Synonyms: alimony |
| maleficence | (noun) the quality or nature of being harmful or evil | Synonyms: balefulness, mischief |
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| (noun) doing or causing evil | - |
| malevolence | (noun) the quality of threatening evil | Synonyms: malevolency, malice |
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| (noun) wishing evil to others | Synonyms: malignity |
| malfeasance | (noun) wrongful conduct by a public official | - |
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| malice | (noun) the quality of threatening evil | Synonyms: malevolence, malevolency |
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| (noun) feeling a need to see others suffer | Synonyms: maliciousness, spite, spitefulness, venom |
| malignance | (noun) quality of being disposed to evil; intense ill will | Synonyms: malignancy, malignity |
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| (noun) (medicine) a malignant state; progressive and resistant to treatment and tending to cause death | Synonyms: malignancy |
| malpractice | (noun) a wrongful act that the actor had no right to do; improper professional conduct | - |
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| (noun) professional wrongdoing that results in injury or damage | - |
| mantelpiece | (noun) shelf that projects from wall above fireplace | Synonyms: chimneypiece, mantel, mantle, mantlepiece |
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| mantlepiece | (noun) shelf that projects from wall above fireplace | Synonyms: chimneypiece, mantel, mantelpiece, mantle |
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| marketplace | (noun) the world of commercial activity where goods and services are bought and sold | Synonyms: market, market place |
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| (noun) an area in a town where a public mercantile establishment is set up | Synonyms: market, market place, mart |
| masterpiece | (noun) an outstanding achievement | - |
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| (noun) the most outstanding work of a creative artist or craftsman | Synonyms: chef-d'oeuvre |
| menace | (noun) a threat or the act of threatening | - |
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| (noun) something that is a source of danger | Synonyms: threat |
| (verb) act in a threatening manner | - |
| (verb) express a threat either by an utterance or a gesture | - |
| (verb) pose a threat to; present a danger to | Synonyms: endanger, imperil, jeopardise, jeopardize, peril, threaten |
| mesalliance | (noun) a marriage with a person of inferior social status | - |
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| microbalance | (noun) balance for weighing very small objects | - |
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| microdevice | (noun) any very small device manufactured using microfabrication. | - |
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| militance | (noun) a militant aggressiveness | Synonyms: combativeness, militancy |
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| millrace | (noun) a channel for the water current that turns a millwheel | Synonyms: millrun |
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| mince | (noun) food chopped into small bits | - |
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| (verb) make less severe or harsh | Synonyms: moderate, soften |
| (verb) cut into small pieces | - |
| (verb) walk daintily | - |
| misalliance | (noun) an unsuitable alliance (especially with regard to marriage) | - |
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| mischance | (noun) an instance of misfortune | Synonyms: misadventure, mishap |
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| (noun) an unpredictable outcome that is unfortunate | Synonyms: bad luck, mishap |
| misfeasance | (noun) doing a proper act in a wrongful or injurious manner | - |
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| misplace | (verb) place or position wrongly; put in the wrong position | - |
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| (verb) place (something) where one cannot find it again | Synonyms: mislay |
| mispronounce | (verb) pronounce a word incorrectly | Synonyms: misspeak |
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| monitrice | (noun) an assistant (often the father of the soon-to-be-born child) who provides support for a woman in labor by encouraging her to use techniques learned in childbirth-preparation classes | Synonyms: birthing coach, doula, labor coach |
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| monstrance | (noun) (Roman Catholic Church) a vessel (usually of gold or silver) in which the consecrated Host is exposed for adoration | Synonyms: ostensorium |
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| (noun) proof by a process of argument or a series of proposition proving an asserted conclusion | Synonyms: demonstration |
| mortice | (noun) a square hole made to receive a tenon and so to form a joint | Synonyms: mortise |
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| (verb) join by a tenon and mortise | Synonyms: mortise |
| (verb) cut a hole for a tenon in | Synonyms: mortise |
| mouthpiece | (noun) the aperture of a wind instrument into which the player blows directly | Synonyms: embouchure |
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| (noun) the tube of a pipe or cigarette holder that a smoker holds in the mouth | - |
| (noun) an acoustic device; the part of a telephone into which a person speaks | - |
| (noun) (especially boxing) equipment that protects an athlete's mouth | Synonyms: gumshield |
| (noun) a part that goes over or into the mouth of a person | - |
| (noun) a spokesperson (as a lawyer) | Synonyms: mouth |
| multivalence | (noun) (chemistry) the state of having a valence greater than two | Synonyms: multivalency, polyvalence, polyvalency |
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| munificence | (noun) liberality in bestowing gifts; extremely liberal and generous of spirit | Synonyms: largess, largesse, magnanimity, openhandedness |
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| nance | (noun) offensive term for a homosexual man | Synonyms: fag, faggot, fagot, fairy, pansy, poof, poove, pouf, queen, queer |
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| nascence | (noun) the event of being born | Synonyms: birth, nascency, nativity |
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| necklace | (noun) jewelry consisting of a cord or chain (often bearing gems) worn about the neck as an ornament (especially by women) | - |
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| neckpiece | (noun) an article of apparel worn about the neck | - |
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| negligence | (noun) failure to act with the prudence that a reasonable person would exercise under the same circumstances | Synonyms: carelessness, neglect, nonperformance |
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| (noun) the trait of neglecting responsibilities and lacking concern | Synonyms: neglect, neglectfulness |
| nescience | (noun) ignorance (especially of orthodox beliefs) | Synonyms: ignorantness, unknowing, unknowingness |
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| neuroscience | (noun) the scientific study of the nervous system | - |
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| nice | (adjective) pleasant or pleasing or agreeable in nature or appearance | - |
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| (adjective) excessively fastidious and easily disgusted | Synonyms: dainty, overnice, prissy, squeamish |
| (adjective) exhibiting courtesy and politeness | Synonyms: courteous, gracious |
| (adjective) socially or conventionally correct; refined or virtuous | Synonyms: decent |
| (adjective) done with delicacy and skill | Synonyms: skillful |
| niece | (noun) a daughter of your brother or sister | - |
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| ninepence | (noun) a coin worth nine pennies | - |
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| nonacceptance | (noun) the act of refusing an offer | Synonyms: turndown |
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| nonappearance | (noun) failure to appear (especially as at court) | - |
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| nonattendance | (noun) the failure to attend | - |
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| nonce | (noun) the present occasion | Synonyms: time being |
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| nonchalance | (noun) the trait of remaining calm and seeming not to care; a casual lack of concern | Synonyms: indifference, unconcern |
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| noncompliance | (noun) the failure to obey | Synonyms: disobedience |
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| nonconformance | (noun) failure to conform to accepted standards of behavior | Synonyms: nonconformity |
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| (noun) a lack of orthodoxy in thoughts or beliefs | Synonyms: nonconformism, nonconformity |
| nonequivalence | (noun) not interchangeable | - |
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| nonexistence | (noun) the state of not existing | Synonyms: nonentity |
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| nonfeasance | (noun) a failure to act when under an obligation to do so; a refusal (without sufficient excuse) to do that which it is your legal duty to do | - |
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| nonindulgence | (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: asceticism, austerity |
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