| leviathan | (noun) the largest or most massive thing of its kind | - |
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| (noun) monstrous sea creature symbolizing evil in the Old Testament | - |
| levirate | (noun) the biblical institution whereby a man must marry the widow of his childless brother in order to maintain the brother's line | - |
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| levis | (noun) a popular brand of jeans | Synonyms: Levi's |
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| levitate | (verb) be suspended in the air, as if in defiance of gravity | Synonyms: hover |
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| (verb) cause to rise in the air and float, as if in defiance of gravity | - |
| levitation | (noun) the act of raising (a body) from the ground by presumably spiritualistic means | - |
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| (noun) movement upward in virtue of lightness | - |
| (noun) the phenomenon of a person or thing rising into the air by apparently supernatural means | - |
| levity | (noun) a manner lacking seriousness | - |
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| (noun) feeling an inappropriate lack of seriousness | - |
| levodopa | (noun) the levorotatory form of dopa (trade names Bendopa and Brocadopa and Larodopa); as a drug it is used to treat Parkinson's disease | Synonyms: Bendopa, Brocadopa, L-dopa, Larodopa |
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| levorotary | (adjective) rotating to the left | Synonyms: left-handed, levorotatory |
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| levorotation | (noun) rotation to the left | Synonyms: counterclockwise rotation |
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| levorotatory | (adjective) rotating to the left | Synonyms: left-handed, levorotary |
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| levulose | (noun) a simple sugar found in honey and in many ripe fruits | Synonyms: fructose, fruit sugar, laevulose |
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| levy | (noun) the act of drafting into military service | Synonyms: levy en masse |
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| (noun) a charge imposed and collected | - |
| (verb) cause to assemble or enlist in military | Synonyms: raise, recruit |
| (verb) impose and collect | Synonyms: impose |
| longevity | (noun) duration of service | Synonyms: length of service |
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| (noun) the property of being long-lived | Synonyms: seniority |
| macroevolution | (noun) evolution on a large scale extending over geologic era and resulting in the formation of new taxonomic groups | - |
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| maglev | (noun) high-speed rail technology; train is suspended on a magnetic cushion above a magnetized track and so travels free of friction | Synonyms: magnetic levitation |
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| malevolence | (noun) the quality of threatening evil | Synonyms: malevolency, malice |
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| (noun) wishing evil to others | Synonyms: malignity |
| malevolency | (noun) the quality of threatening evil | Synonyms: malevolence, malice |
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| malevolent | (adjective) having or exerting a malignant influence | Synonyms: evil, malefic, malign |
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| (adjective) wishing or appearing to wish evil to others; arising from intense ill will or hatred | - |
| malevolently | (adverb) in a malevolent manner | - |
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| masdevallia | (noun) any of numerous orchids of the genus Masdevallia; tufted evergreen often diminutive plants whose flowers in a remarkable range of colors usually resemble a tricorn with sepals fused at the base to form a tube | - |
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| medevac | (noun) the evacuation of persons (usually by air transportation) to a place where they can receive medical care | Synonyms: medical evacuation, medivac |
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| mediaeval | (adjective) relating to or belonging to the Middle Ages | Synonyms: medieval |
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| (adjective) as if belonging to the Middle Ages; old-fashioned and unenlightened | Synonyms: gothic, medieval |
| (adjective) characteristic of the time of chivalry and knighthood in the Middle Ages | Synonyms: chivalric, knightly, medieval |
| medieval | (adjective) relating to or belonging to the Middle Ages | Synonyms: mediaeval |
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| (adjective) as if belonging to the Middle Ages; old-fashioned and unenlightened | Synonyms: gothic, mediaeval |
| (adjective) characteristic of the time of chivalry and knighthood in the Middle Ages | Synonyms: chivalric, knightly, mediaeval |
| medievality | (noun) The quality of being of or relating to the Middle Ages, perhaps circa 500 to circa 1500 CE. | - |
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| mendelevium | (noun) a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol) | Synonyms: atomic number 101, Md, Mv |
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| microdevice | (noun) any very small device manufactured using microfabrication. | - |
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| microevolution | (noun) evolution resulting from small specific genetic changes that can lead to a new subspecies | - |
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| misbelieve | (verb) hold a false or unorthodox belief | - |
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| misbeliever | (noun) a person who holds religious beliefs in conflict with the dogma of the Roman Catholic Church | Synonyms: heretic, religious outcast |
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| mischievous | (adjective) deliberately causing harm or damage | - |
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| (adjective) naughtily or annoyingly playful | Synonyms: arch, impish, implike, pixilated, prankish, puckish, wicked |
| mischievously | (adverb) in a disobedient or naughty way | Synonyms: badly, naughtily |
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| mischievousness | (noun) reckless or malicious behavior that causes discomfort or annoyance in others | Synonyms: devilment, devilry, deviltry, mischief-making, mischief, rascality, roguery, roguishness, shenanigan |
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| (noun) an attribute of mischievous children | Synonyms: badness, naughtiness |
| (noun) the trait of behaving like an imp | Synonyms: impishness, puckishness, whimsicality |
| multilevel | (adjective) of a building having more than one level | - |
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| neoevolutionism | (noun) school of anthropology concerned with long-term culture change and with the similar patterns of development that may be seen in unrelated, widely separated cultures. | Synonyms: neo-evolutionism |
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| neve | (noun) the upper part of a glacier (beyond the limit of perpetual snow) where the snow turns to ice | - |
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| never | (adverb) not at all; certainly not; not in any circumstances; not ever; at no time in the past or future | Synonyms: ne'er |
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| nevermore | (adverb) at no time hereafter | Synonyms: never again |
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| nevertheless | (adverb) despite anything to the contrary (usually preceding a concession) | Synonyms: all the same, at the same time, even so, however, nonetheless, notwithstanding, still, withal, yet |
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| nevirapine | (noun) a non-nucleoside reverse transcriptase inhibitor (trade name Viramune) used to treat AIDS and HIV | Synonyms: Viramune |
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| nevus | (noun) a blemish on the skin that is formed before birth | Synonyms: birthmark |
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| nonachievement | (noun) an act that does not achieve its intended goal | Synonyms: nonaccomplishment |
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| nonachiever | (noun) a student who does not perform as well as expected or as well as the IQ indicates | Synonyms: underachiever, underperformer |
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| nonbeliever | (noun) someone who refuses to believe (as in a divinity) | - |
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| nondevelopment | (noun) failure of normal development to occur | - |
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| nonevent | (noun) an anticipated event that turns out to be far less significant than was expected | - |
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| nonreversible | (adjective) not reversible or capable of having either side out | Synonyms: one-sided |
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| overachieve | (verb) perform better or achieve a greater degree of success than expected | - |
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| overachievement | (noun) better than expected performance (better than might have been predicted from intelligence tests) | - |
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| overachiever | (noun) a student who attains higher standards than the IQ indicated | - |
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| pareve | (adjective) containing no meat or milk (or their derivatives) and thus eatable with both meat and dairy dishes according to the dietary laws of Judaism | Synonyms: parve |
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| peeve | (noun) an annoyed or irritated mood | - |
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| (verb) cause to be annoyed, irritated, or resentful | - |
| peeved | (adjective) aroused to impatience or anger | Synonyms: annoyed, irritated, miffed, nettled, pissed, pissed off, riled, roiled, steamed, stung |
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| peevish | (adjective) easily irritated or annoyed | Synonyms: cranky, fractious, irritable, nettlesome, peckish, pettish, petulant, scratchy, techy, testy, tetchy |
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| peevishly | (adverb) in a peevish manner | Synonyms: fractiously, querulously |
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| peevishness | (noun) a disposition to exhibit uncontrolled anger | Synonyms: biliousness, irritability, pettishness, snappishness, surliness, temper |
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| (noun) an irritable petulant feeling | Synonyms: choler, crossness, fretfulness, fussiness, irritability, petulance |
| perseverance | (noun) the act of persisting or persevering; continuing or repeating behavior | Synonyms: perseveration, persistence |
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| (noun) persistent determination | Synonyms: doggedness, persistence, persistency, pertinacity, tenaciousness, tenacity |
| perseverate | (verb) repeat a response after the cessation of the original stimulus | - |
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| perseveration | (noun) the act of persisting or persevering; continuing or repeating behavior | Synonyms: perseverance, persistence |
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| (noun) the tendency for a memory or idea to persist or recur without any apparent stimulus for it | - |
| persevere | (verb) be persistent, refuse to stop | Synonyms: hang in, hang on, hold on, persist |
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| persevering | (adjective) quietly and steadily persevering especially in detail or exactness | Synonyms: diligent |
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| perseveringly | (adverb) with perseverance | - |
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| prevail | (verb) use persuasion successfully | - |
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| (verb) prove superior | Synonyms: triumph |
| (verb) continue to exist | Synonyms: die hard, endure, persist, run |
| (verb) be valid, applicable, or true | Synonyms: hold, obtain |
| (verb) be larger in number, quantity, power, status or importance | Synonyms: dominate, predominate, reign, rule |
| prevailing | (adjective) most frequent or common | Synonyms: dominant, predominant, prevalent, rife |
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| prevalence | (noun) the quality of prevailing generally; being widespread | - |
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| (noun) a superiority in numbers or amount | Synonyms: preponderance |
| (noun) (epidemiology) the ratio (for a given time period) of the number of occurrences of a disease or event to the number of units at risk in the population | - |
| prevalent | (adjective) most frequent or common | Synonyms: dominant, predominant, prevailing, rife |
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| prevaricate | (verb) be deliberately ambiguous or unclear in order to mislead or withhold information | Synonyms: beat around the bush, equivocate, palter, tergiversate |
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| prevarication | (noun) the deliberate act of deviating from the truth | Synonyms: fabrication, lying |
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| (noun) intentionally vague or ambiguous | Synonyms: equivocation, evasiveness |
| (noun) a statement that deviates from or perverts the truth | Synonyms: lie |
| prevaricator | (noun) a person who has lied or who lies repeatedly | Synonyms: liar |
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| prevenient | (adjective) in anticipation | Synonyms: anticipatory |
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| prevent | (verb) stop (someone or something) from doing something or being in a certain state | Synonyms: keep |
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| (verb) keep from happening or arising; make impossible | Synonyms: forbid, foreclose, forestall, preclude |
| preventable | (adjective) capable of being prevented | - |
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| preventative | (adjective) tending to prevent or hinder | Synonyms: preventive |
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| (adjective) preventing or contributing to the prevention of disease | Synonyms: preventive, prophylactic |
| (noun) remedy that prevents or slows the course of an illness or disease | Synonyms: preventive, prophylactic |
| (noun) an agent or device intended to prevent conception | Synonyms: birth control device, contraceptive, contraceptive device, preventive, prophylactic device |
| (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, hitch, incumbrance, interference, preventive |
| prevention | (noun) the act of preventing | Synonyms: bar |
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| preventive | (adjective) tending to prevent or hinder | Synonyms: preventative |
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| (adjective) preventing or contributing to the prevention of disease | Synonyms: preventative, prophylactic |
| (noun) remedy that prevents or slows the course of an illness or disease | Synonyms: preventative, prophylactic |
| (noun) an agent or device intended to prevent conception | Synonyms: birth control device, contraceptive, contraceptive device, preventative, prophylactic device |
| (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, hitch, incumbrance, interference, preventative |
| preventiveness | (noun) The property of preventing, hindering, or acting as an obstacle to something. | - |
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| preview | (noun) a screening for a select audience in advance of release for the general public | - |
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| (noun) an advertisement consisting of short scenes from a motion picture that will appear in the near future | Synonyms: prevue, trailer |
| (verb) watch (a movie or play) before it is released to the general public | - |
| previous | (adjective) too soon or too hasty | Synonyms: premature |
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| (adjective) (used especially of persons) of the immediate past | Synonyms: former, late |
| (adjective) just preceding something else in time or order | Synonyms: old |
| previously | (adverb) at an earlier time or formerly | Synonyms: antecedently |
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| previse | (verb) realize beforehand | Synonyms: anticipate, foreknow, foresee |
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| (verb) warn in advance or beforehand; give an early warning | Synonyms: forewarn |
| prevision | (noun) the power to foresee the future | Synonyms: prescience |
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| (noun) a prophetic vision (as in a dream) | - |
| (noun) seeing ahead; knowing in advance; foreseeing | Synonyms: farsightedness, foresight, prospicience |
| (noun) the act of predicting (as by reasoning about the future) | Synonyms: anticipation, prediction |
| prevue | (noun) an advertisement consisting of short scenes from a motion picture that will appear in the near future | Synonyms: preview, trailer |
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| primaeval | (adjective) having existed from the beginning; in an earliest or original stage or state | Synonyms: aboriginal, primal, primeval, primordial |
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| primeval | (adjective) having existed from the beginning; in an earliest or original stage or state | Synonyms: aboriginal, primaeval, primal, primordial |
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| redevelop | (verb) change the plans for the use of (land) | - |
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| (verb) formulate or develop again, of an improved theory or hypothesis | Synonyms: reformulate |
| (verb) develop for a second time, in order to improve the contrast, colour, etc., of a negative or print | - |
| redevelopment | (noun) the act of improving by renewing and restoring | Synonyms: overhaul, renovation |
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| reevaluate | (verb) revise or renew one's assessment | Synonyms: reassess |
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| reevaluation | (noun) the evaluation of something a second time (or more) | - |
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| reeve | (noun) female ruff | - |
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| (verb) fasten by passing through a hole or around something | - |
| (verb) pass through a hole or opening | - |
| (verb) pass a rope through | - |
| relevance | (noun) the relation of something to the matter at hand | Synonyms: relevancy |
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| relevancy | (noun) the relation of something to the matter at hand | Synonyms: relevance |
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| relevant | (adjective) having a bearing on or connection with the subject at issue | - |
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| relevantly | (adverb) with relevance | - |
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| relieve | (verb) provide physical relief, as from pain | Synonyms: alleviate, assuage, palliate |
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| (verb) provide relief for | Synonyms: remedy |
| (verb) alleviate or remove (pressure or stress) or make less oppressive | Synonyms: lighten |
| (verb) relieve oneself of troubling information | Synonyms: unbosom |
| (verb) grant exemption or release to | Synonyms: excuse, exempt, let off |
| (verb) lessen the intensity of or calm | Synonyms: allay, ease, still |
| (verb) take by stealing | - |
| (verb) free from a burden, evil, or distress | - |
| (verb) save from ruin, destruction, or harm | Synonyms: salvage, salve, save |
| (verb) free someone temporarily from his or her obligations | Synonyms: take over |
| (verb) grant relief or an exemption from a rule or requirement to | Synonyms: exempt, free |
| relieved | (adjective) (of pain or sorrow) made easier to bear | Synonyms: alleviated, eased |
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| (adjective) extending out above or beyond a surface or boundary | Synonyms: jutting, projected, projecting, protruding, sticking, sticking out |
| reliever | (noun) a pitcher who does not start the game | Synonyms: fireman, relief pitcher |
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| (noun) someone who takes the place of another (as when things get dangerous or difficult) | Synonyms: backup, backup man, fill-in, relief, stand-in, substitute |
| (noun) a person who reduces the intensity (e.g., of fears) and calms and pacifies | Synonyms: allayer, comforter |
| relievo | (noun) sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background | Synonyms: embossment, relief, rilievo, sculptural relief |
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| reprieve | (noun) the act of reprieving; postponing or remitting punishment | Synonyms: respite |
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| (noun) a warrant granting postponement (usually to postpone the execution of the death sentence) | - |
| (noun) an interruption in the intensity or amount of something | Synonyms: abatement, hiatus, respite, suspension |
| (noun) a (temporary) relief from harm or discomfort | Synonyms: respite |
| (verb) relieve temporarily | - |
| (verb) postpone the punishment of a convicted criminal, such as an execution | Synonyms: respite |
| retrievable | (adjective) capable of being regained especially with effort | - |
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| retrieval | (noun) the act of regaining or saving something lost (or in danger of becoming lost) | Synonyms: recovery |
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| (noun) the cognitive operation of accessing information in memory | - |
| (noun) (computer science) the operation of accessing information from the computer's memory | - |
| retrieve | (verb) recall knowledge from memory; have a recollection | Synonyms: call back, call up, recall, recollect, remember, think |
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| (verb) run after, pick up, and bring to the master | - |
| (verb) go for and bring back | - |
| (verb) get or find back; recover the use of | Synonyms: find, recover, regain |