| irrevocability | (noun) The state or condition of being impossible to retract or reverse; finality. | - |
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| ivory | (noun) a shade of white the color of bleached bones | Synonyms: bone, off-white, pearl |
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| (noun) a hard smooth ivory colored dentine that makes up most of the tusks of elephants and walruses | Synonyms: tusk |
| ivorybill | (noun) large black-and-white woodpecker of southern United States and Cuba having an ivory bill; nearly extinct | Synonyms: Campephilus principalis, ivory-billed woodpecker |
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| kilovolt | (noun) a unit of potential equal to a thousand volts | Synonyms: kV |
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| 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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| levorotation | (noun) rotation to the left | Synonyms: counterclockwise rotation |
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| macroevolution | (noun) evolution on a large scale extending over geologic era and resulting in the formation of new taxonomic groups | - |
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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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| microevolution | (noun) evolution resulting from small specific genetic changes that can lead to a new subspecies | - |
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| microvolt | (noun) a unit of potential equal to one millionth of a volt | - |
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| millivolt | (noun) a unit of potential equal to one thousandth of a volt | Synonyms: mV |
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| millivoltmeter | (noun) sensitive voltmeter that can measure voltage in millivolts | - |
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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 |
| nanovolt | (noun) a unit of potential equal to one billionth of a volt | - |
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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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| nervousness | (noun) a sensitive or highly strung temperament | - |
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| (noun) the anxious feeling you have when you have the jitters | Synonyms: jitteriness, jumpiness, restiveness |
| (noun) an uneasy psychological state | Synonyms: nerves |
| novobiocin | (noun) an antibiotic obtained from an actinomycete and used to treat infections by Gram-positive bacteria | - |
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| novocaine | (noun) procaine administered as a hydrochloride (trade name Novocain) | Synonyms: Novocain, procaine hydrochloride |
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| octavo | (noun) the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves | Synonyms: 8vo, eightvo |
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| omnivore | (noun) an animal that feeds on both animal and vegetable substances | - |
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| (noun) a person who eats all kinds of foods | - |
| omnivorousness | (noun) The state of eating both animal and plant matter. | - |
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| ovoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: hepatoflavin, lactoflavin, riboflavin, vitamin B2, vitamin G |
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| ovoid | (noun) an egg-shaped object | - |
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| ovolo | (noun) a convex molding having a cross section in the form of a quarter of a circle or of an ellipse | Synonyms: quarter round, thumb |
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| ovotestis | (noun) hermaphroditic gonad that contains both testicular and ovarian tissue | - |
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| parvo | (noun) any of a group of viruses containing DNA in an icosahedral protein shell and causing disease in dogs and cattle; not known to be associated with any human disease | Synonyms: parvovirus |
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| parvovirus | (noun) any of a group of viruses containing DNA in an icosahedral protein shell and causing disease in dogs and cattle; not known to be associated with any human disease | Synonyms: parvo |
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| pavonia | (noun) any of various evergreen plants of the genus Pavonia having white or yellow or purple flowers | - |
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| picovolt | (noun) a unit of potential equal to one trillionth of a volt | - |
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| pivot | (noun) the act of turning on (or as if on) a pivot | - |
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| (noun) axis consisting of a short shaft that supports something that turns | Synonyms: pin |
| (noun) the person in a rank around whom the others wheel and maneuver | Synonyms: pivot man |
| provocateur | (noun) a secret agent who incites suspected persons to commit illegal acts | Synonyms: agent provocateur |
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| provocation | (noun) unfriendly behavior that causes anger or resentment | Synonyms: aggravation, irritation |
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| (noun) needed encouragement | Synonyms: incitement |
| (noun) something that incites or provokes; a means of arousing or stirring to action | Synonyms: incitation, incitement |
| provoker | (noun) someone who deliberately foments trouble | Synonyms: firebrand, inciter, instigant, instigator |
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| provost | (noun) a high-ranking university administrator | - |
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| rauvolfia | (noun) any shrub or small tree of the genus Rauwolfia having leaves in whorls and cymose flowers; yield substances used medicinally especially as emetics or purgatives or antihypertensives | Synonyms: rauwolfia |
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| 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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| rendezvous | (noun) a meeting planned at a certain time and place | - |
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| (noun) a date; usually with a member of the opposite sex | Synonyms: tryst |
| (noun) a place where people meet | - |
| reservoir | (noun) tank used for collecting and storing a liquid (as water or oil) | - |
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| (noun) lake used to store water for community use; a lake (natural or artificial) used to store water and used as a source of water | Synonyms: artificial lake, man-made lake |
| (noun) anything (a person or animal or plant or substance) in which an infectious agent normally lives and multiplies | Synonyms: source |
| (noun) a large or extra supply of something | - |
| revocation | (noun) the act (by someone having the authority) of annulling something previously done | - |
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| (noun) the state of being cancelled or annulled | Synonyms: annulment |
| revoke | (noun) the mistake of not following suit when able to do so | Synonyms: renege |
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| revolt | (noun) organized opposition to authority; a conflict in which one faction tries to wrest control from another | Synonyms: insurrection, rebellion, rising, uprising |
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| revolution | (noun) the overthrow of a government by those who are governed | - |
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| (noun) a single complete turn (axial or orbital) | Synonyms: gyration, rotation |
| (noun) a drastic and far-reaching change in ways of thinking and behaving | - |
| revolutionariness | (noun) The state or quality of being revolutionary. | - |
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| revolutionary | (noun) a radical supporter of political or social revolution | Synonyms: revolutionist, subversive, subverter |
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| revolutionism | (noun) a belief in the spread of revolutionary principles | - |
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| revolutionist | (noun) a radical supporter of political or social revolution | Synonyms: revolutionary, subversive, subverter |
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| revolver | (noun) a pistol with a revolving cylinder (usually having six chambers for bullets) | Synonyms: six-gun, six-shooter |
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| (noun) a door consisting of four orthogonal partitions that rotate about a central pivot; a door designed to equalize the air pressure in tall buildings | Synonyms: revolving door |
| rilievo | (noun) sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background | Synonyms: embossment, relief, relievo, sculptural relief |
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| salvo | (noun) rapid simultaneous discharge of firearms | Synonyms: burst, fusillade, volley |
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| (noun) a sudden outburst of cheers | - |
| (noun) an outburst resembling the discharge of firearms or the release of bombs | - |
| salvor | (noun) someone who salvages | Synonyms: salvager |
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| savor | (noun) the taste experience when a savoury condiment is taken into the mouth | Synonyms: flavor, flavour, nip, relish, sapidity, savour, smack, tang |
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| savoriness | (noun) having an appetizing flavor | Synonyms: flavorsomeness, flavoursomeness |
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| savoring | (noun) taking a small amount into the mouth to test its quality | Synonyms: degustation, relishing, savouring, tasting |
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| savorlessness | (noun) the property of having no flavor | Synonyms: flavorlessness, flavourlessness, savourlessness, tastelessness |
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| savory | (noun) either of two aromatic herbs of the mint family | Synonyms: savoury |
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| (noun) an aromatic or spicy dish served at the end of dinner or as an hors d'oeuvre | Synonyms: savoury |
| (noun) any of several aromatic herbs or subshrubs of the genus Satureja having spikes of flowers attractive to bees | - |
| (noun) dwarf aromatic shrub of Mediterranean regions | Synonyms: Micromeria juliana |
| savour | (noun) the taste experience when a savoury condiment is taken into the mouth | Synonyms: flavor, flavour, nip, relish, sapidity, savor, smack, tang |
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| savouring | (noun) taking a small amount into the mouth to test its quality | Synonyms: degustation, relishing, savoring, tasting |
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| savourlessness | (noun) the property of having no flavor | Synonyms: flavorlessness, flavourlessness, savorlessness, tastelessness |
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| savoury | (noun) either of two aromatic herbs of the mint family | Synonyms: savory |
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| (noun) an aromatic or spicy dish served at the end of dinner or as an hors d'oeuvre | Synonyms: savory |
| savoy | (noun) head of soft crinkly leaves | Synonyms: savoy cabbage |
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| semivowel | (noun) a vowellike sound that serves as a consonant | Synonyms: glide |
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| servo | (noun) control system that converts a small mechanical motion into one requiring much greater power; may include a negative feedback system | Synonyms: servomechanism, servosystem |
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| servomechanism | (noun) control system that converts a small mechanical motion into one requiring much greater power; may include a negative feedback system | Synonyms: servo, servosystem |
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| servosystem | (noun) control system that converts a small mechanical motion into one requiring much greater power; may include a negative feedback system | Synonyms: servo, servomechanism |
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| slivovitz | (noun) a colorless plum brandy popular in the Balkans | - |
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| subvocaliser | (noun) someone who articulates speech without uttering sounds | Synonyms: subvocalizer |
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| subvocalizer | (noun) someone who articulates speech without uttering sounds | Synonyms: subvocaliser |
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| survivor | (noun) an animal that survives in spite of adversity | - |
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| (noun) one who outlives another | - |
| (noun) one who lives through affliction | Synonyms: subsister |
| svoboda | (noun) (Russia) freedom | - |
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| unavoidability | (noun) the quality of being impossible to avoid or evade | Synonyms: ineluctability |
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| unequivocalness | (noun) clarity achieved by the avoidance of ambiguity | Synonyms: unambiguity |
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| unfavorableness | (noun) the quality of not being encouraging or indicative of success | Synonyms: unfavourableness |
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| unfavourableness | (noun) the quality of not being encouraging or indicative of success | Synonyms: unfavorableness |
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| unsavoriness | (noun) extreme unpalatability to the mouth | Synonyms: disgustingness, distastefulness, nauseatingness, sickeningness |
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| (noun) the property of being extremely unacceptable to the mind | Synonyms: disgustingness |
| upvote | (noun) A positive vote on a social media website | - |
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| valvotomy | (noun) incision into a stenosed cardiac valve to relieve the obstruction | Synonyms: valvulotomy |
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| vocable | (noun) a word that is spoken aloud | Synonyms: spoken word |
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| vocabulary | (noun) a language user's knowledge of words | Synonyms: lexicon, mental lexicon |
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| (noun) the system of techniques or symbols serving as a means of expression (as in arts or crafts) | - |
| (noun) a listing of the words used in some enterprise | - |
| vocal | (noun) music intended to be performed by one or more singers, usually with instrumental accompaniment | Synonyms: vocal music |
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| (noun) a short musical composition with words | Synonyms: song |
| vocalisation | (noun) the sound made by the vibration of vocal folds modified by the resonance of the vocal tract | Synonyms: phonation, vocalism, vocalization, voice, vox |
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| vocaliser | (noun) a person who sings | Synonyms: singer, vocalist, vocalizer |
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| (noun) an organism that can utter vocal sounds | Synonyms: utterer, vocalizer |
| vocalism | (noun) the sound made by the vibration of vocal folds modified by the resonance of the vocal tract | Synonyms: phonation, vocalisation, vocalization, voice, vox |
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| (noun) the system of vowels used in a particular language | Synonyms: vowel system |
| vocalist | (noun) a person who sings | Synonyms: singer, vocaliser, vocalizer |
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| vocalization | (noun) the sound made by the vibration of vocal folds modified by the resonance of the vocal tract | Synonyms: phonation, vocalisation, vocalism, voice, vox |
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| (noun) the use of uttered sounds for auditory communication | Synonyms: utterance |
| vocalizer | (noun) a person who sings | Synonyms: singer, vocaliser, vocalist |
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| (noun) an organism that can utter vocal sounds | Synonyms: utterer, vocaliser |
| vocalizing | (noun) the act of singing vocal music | Synonyms: singing |
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| vocation | (noun) the particular occupation for which you are trained | Synonyms: calling, career |
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| (noun) a body of people doing the same kind of work | Synonyms: occupational group |
| vocative | (noun) the case (in some inflected languages) used when the referent of the noun is being addressed | Synonyms: vocative case |
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| vociferation | (noun) a loud utterance; often in protest or opposition | Synonyms: call, cry, outcry, shout, yell |
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| vociferator | (noun) a loud and vehement speaker (usually in protest) | - |
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| vodka | (noun) unaged colorless liquor originating in Russia | - |
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| vodoun | (noun) a religious cult practiced chiefly in Caribbean countries (especially Haiti); involves witchcraft and animistic deities | Synonyms: hoodooism, voodoo, voodooism |
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| vogue | (noun) the popular taste at a given time | Synonyms: style, trend |
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| (noun) a current state of general acceptance and use | - |
| voice | (noun) a means or agency by which something is expressed or communicated | - |
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| (noun) the distinctive quality or pitch or condition of a person's speech | - |
| (noun) the ability to speak | - |
| (noun) the sound made by the vibration of vocal folds modified by the resonance of the vocal tract | Synonyms: phonation, vocalisation, vocalism, vocalization, vox |
| (noun) expressing in coherent verbal form | Synonyms: articulation |
| (noun) the melody carried by a particular voice or instrument in polyphonic music | Synonyms: part |
| (noun) something suggestive of speech in being a medium of expression | - |
| (noun) A term used in phonetics and phonology to characterize speech sounds, with sounds described as either voiceless (unvoiced) or voiced. | - |
| (noun) a sound suggestive of a vocal utterance | - |
| (noun) an advocate who represents someone else's policy or purpose | Synonyms: interpreter, representative, spokesperson |
| (noun) (metonymy) a singer | - |
| (noun) (linguistics) the grammatical relation (active or passive) of the grammatical subject of a verb to the action that the verb denotes | - |
| voicelessness | (noun) having no voice in the management or control of affairs | - |
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| (noun) speaking softly without vibration of the vocal cords | Synonyms: susurration, whisper, whispering |
| (noun) (phonetics, of a consonant) The property of being spoken without vibration of the vocal cords, as [t], [s], or [f]. | - |
| (noun) a disorder of the vocal organs that results in the loss of voice | Synonyms: aphonia |
| voicemail | (noun) a computerized system for answering and routing telephone calls; telephone messages can be recorded and stored and relayed | Synonyms: voice mail |
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| voiceprint | (noun) biometric identification by electronically recording and graphically representing a person's voice | - |
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| voicer | (noun) a speaker who voices an opinion | - |
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| (noun) someone who regulates the tone of organ pipes | - |
| voicing | (noun) the act of adjusting an organ pipe (or wind instrument) so that it conforms to the standards of tone and pitch and color | - |
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