| motivator | (noun) a positive motivational influence | Synonyms: incentive, inducement |
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| motive | (noun) the psychological feature that arouses an organism to action toward a desired goal; the reason for the action; that which gives purpose and direction to behavior | Synonyms: motivation, need |
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| (noun) a design or figure that consists of recurring shapes or colors, as in architecture or decoration | Synonyms: motif |
| (noun) a theme that is repeated or elaborated in a piece of music | Synonyms: motif |
| motivity | (noun) the power or ability to move | Synonyms: locomotion, motive power |
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| motley | (noun) a multicolored woolen fabric woven of mixed threads in 14th to 17th century England | - |
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| (noun) a garment made of motley (especially a court jester's costume) | - |
| (noun) a collection containing a variety of sorts of things | Synonyms: assortment, miscellanea, miscellany, mixed bag, mixture, potpourri, salmagundi, smorgasbord, variety |
| motmot | (noun) tropical American bird resembling a blue jay and having greenish and bluish plumage | Synonyms: momot |
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| motoneuron | (noun) a neuron conducting impulses outwards from the brain or spinal cord | Synonyms: efferent neuron, motor nerve fiber, motor neuron |
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| motor | (noun) machine that converts other forms of energy into mechanical energy and so imparts motion | - |
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| (noun) a nonspecific agent that imparts motion | - |
| motorbike | (noun) small motorcycle with a low frame and small wheels and elevated handlebars | Synonyms: minibike |
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| motorboat | (noun) a boat propelled by an internal-combustion engine | Synonyms: powerboat |
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| motorbus | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorcoach, omnibus, passenger vehicle |
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| motorcade | (noun) a procession of people traveling in motor cars | - |
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| motorcar | (noun) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: auto, automobile, car, machine |
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| motorcoach | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorbus, omnibus, passenger vehicle |
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| motorcycle | (noun) a motor vehicle with two wheels and a strong frame | Synonyms: bike |
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| motorcycling | (noun) riding a motorcycle | - |
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| motorcyclist | (noun) a traveler who rides a motorcycle | - |
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| motoring | (noun) the act of driving an automobile | - |
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| motorisation | (noun) the act of motorizing (equipping with motors or with motor vehicles) | Synonyms: motorization |
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| motorist | (noun) someone who drives (or travels in) an automobile | Synonyms: automobilist |
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| motorization | (noun) the act of motorizing (equipping with motors or with motor vehicles) | Synonyms: motorisation |
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| motorman | (noun) the operator of streetcar | - |
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| motormouth | (noun) someone who talks incessantly | - |
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| motortruck | (noun) an automotive vehicle suitable for hauling | Synonyms: truck |
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| motorway | (noun) a broad highway designed for high-speed traffic | Synonyms: expressway, freeway, pike, state highway, superhighway, throughway, thruway |
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| mottle | (noun) an irregular arrangement of patches of color | - |
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| mottling | (noun) the act of coloring with areas of different shades | - |
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| motto | (noun) a favorite saying of a group, organization or individual | Synonyms: catchword, shibboleth, slogan |
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| mugshot | (noun) a photograph of someone's face (especially one made for police records) | Synonyms: mug shot |
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| mycotoxin | (noun) a toxin produced by a fungus | - |
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| myotic | (noun) a drug that causes miosis (constriction of the pupil of the eye) | Synonyms: miotic, miotic drug, myotic drug |
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| myotomy | (noun) surgical incision or division of a muscle | - |
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| myotonia | (noun) abnormally long muscular contractions; slow relaxation of a muscle after a contraction | - |
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| myringotomy | (noun) surgical incision into the eardrum (to relieve pressure or release pus from the middle ear) | - |
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| nanotechnology | (noun) the branch of engineering that deals with things smaller than 100 nanometers (especially with the manipulation of individual molecules) | - |
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| nanotube | (noun) a fullerene molecule having a cylindrical or toroidal shape | Synonyms: carbon nanotube |
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| narcoterrorism | (noun) the financing of terrorist activities by participation in the drug trade | - |
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| narcotic | (noun) a drug that produces numbness or stupor; often taken for pleasure or to reduce pain; extensive use can lead to addiction | - |
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| narcotraffic | (noun) traffic in illegal drugs | Synonyms: drug traffic, drug trafficking |
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| neckcloth | (noun) an ornamental white cravat | Synonyms: stock |
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| negotiant | (noun) someone who negotiates (confers with others in order to reach a settlement) | Synonyms: negotiator, treater |
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| negotiation | (noun) the activity or business of negotiating an agreement; coming to terms | - |
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| (noun) a discussion intended to produce an agreement | Synonyms: dialogue, talks |
| negotiator | (noun) someone who negotiates (confers with others in order to reach a settlement) | Synonyms: negotiant, treater |
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| negotiatress | (noun) a woman negotiator | Synonyms: negotiatrix |
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| negotiatrix | (noun) a woman negotiator | Synonyms: negotiatress |
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| neoteny | (noun) an evolutionary trend to be born earlier so that development is cut off at an earlier stage and juvenile characteristics are retained in adults of the species | - |
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| neotony | (noun) the state resulting when juvenile characteristics are retained by the adults of a species | - |
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| nephrotomy | (noun) incision into a kidney (usually to remove a kidney stone) | - |
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| nephrotoxin | (noun) any toxin that affects the kidneys | - |
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| nepotism | (noun) favoritism shown to relatives or close friends by those in power (as by giving them jobs) | - |
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| nepotist | (noun) a powerful person who shows favoritism to relatives or close friends | - |
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| nerveroot | (noun) once common rose pink woodland orchid of eastern North America | Synonyms: Cypripedium acaule, moccasin flower |
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| neurotic | (noun) a person suffering from neurosis | Synonyms: mental case, psychoneurotic |
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| neuroticism | (noun) a mental or personality disturbance not attributable to any known neurological or organic dysfunction | Synonyms: neurosis, psychoneurosis |
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| neurotoxin | (noun) any toxin that affects neural tissues | Synonyms: neurolysin |
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| neurotransmitter | (noun) a neurochemical that transmits nerve impulses across a synapse | - |
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| neurotropism | (noun) an affinity for neural tissues | - |
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| nicotine | (noun) an alkaloid poison that occurs in tobacco; used in medicine and as an insecticide | - |
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| nightclothes | (noun) garments designed to be worn in bed | Synonyms: nightwear, sleepwear |
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| nightspot | (noun) a spot that is open late at night and that provides entertainment (as singers or dancers) as well as dancing and food and drink | Synonyms: cabaret, club, night club, nightclub |
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| nitrocotton | (noun) a nitric acid ester; used in lacquers and explosives | Synonyms: cellulose nitrate, guncotton, nitrocellulose |
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| normothermia | (noun) normal body temperature | - |
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| notability | (noun) a celebrity who is an inspiration to others | Synonyms: guiding light, leading light, luminary, notable |
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| notable | (noun) a celebrity who is an inspiration to others | Synonyms: guiding light, leading light, luminary, notability |
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| notary | (noun) someone legally empowered to witness signatures and certify a document's validity and to take depositions | Synonyms: notary public |
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| notation | (noun) the activity of representing something by a special system of marks or characters | - |
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| (noun) a technical system of symbols used to represent special things | Synonyms: notational system |
| (noun) a comment or instruction (usually added) | Synonyms: annotation, note |
| notch | (noun) a small cut | Synonyms: nick, snick |
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| (noun) a V-shaped or U-shaped indentation carved or scratched into a surface | - |
| (noun) the location in a range of mountains of a geological formation that is lower than the surrounding peaks | Synonyms: mountain pass, pass |
| (noun) a V-shaped indentation | - |
| note | (noun) a characteristic emotional quality | - |
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| (noun) a brief written record | - |
| (noun) a comment or instruction (usually added) | Synonyms: annotation, notation |
| (noun) a short personal letter | Synonyms: billet, line, short letter |
| (noun) a notation representing the pitch and duration of a musical sound | Synonyms: musical note, tone |
| (noun) a tone of voice that shows what the speaker is feeling | - |
| (noun) a promise to pay a specified amount on demand or at a certain time | Synonyms: note of hand, promissory note |
| (noun) a piece of paper money (especially one issued by a central bank) | Synonyms: bank bill, bank note, banker's bill, banknote, bill, Federal Reserve note, government note, greenback |
| (noun) high status importance owing to marked superiority | Synonyms: distinction, eminence, preeminence |
| notebook | (noun) a small compact portable computer | Synonyms: notebook computer |
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| (noun) a book with blank pages for recording notes or memoranda | - |
| notecase | (noun) a pocket-size case for holding papers and paper money | Synonyms: billfold, pocketbook, wallet |
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| notepad | (noun) a pad of paper for keeping notes | - |
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| notepaper | (noun) writing paper intended for writing short notes or letters | - |
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| nothing | (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, cypher, goose egg, nada, naught, nil, nix, null, zero, zilch, zip, zippo |
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| nothingness | (noun) empty rhetoric or insincere or exaggerated talk | Synonyms: idle words, jazz, malarkey, malarky, wind |
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| (noun) the state of nonexistence | Synonyms: nihility, nullity, void |
| nothings | (noun) inconsequential conversation | - |
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| nothosaur | (noun) extinct marine reptile with longer more slender limbs than plesiosaurs and less completely modified for swimming | - |
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| notice | (noun) the act of noticing or paying attention | Synonyms: observance, observation |
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| (noun) polite or favorable attention | - |
| (noun) a sign posted in a public place as an advertisement | Synonyms: bill, card, placard, poster, posting |
| (noun) an announcement containing information about an event | - |
| (noun) a request for payment | Synonyms: notification |
| (noun) advance notification (usually written) of the intention to withdraw from an arrangement of contract | - |
| (noun) a short critical review | - |
| noticeability | (noun) the property of being easy to see and understand | Synonyms: noticeableness, obviousness, patency |
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| noticeableness | (noun) the property of being easy to see and understand | Synonyms: noticeability, obviousness, patency |
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| noticer | (noun) someone who gives formal notice | - |
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| (noun) someone who takes notice | - |
| notification | (noun) an accusation of crime made by a grand jury on its own initiative | Synonyms: presentment |
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| (noun) informing by words | Synonyms: apprisal, telling |
| (noun) a request for payment | Synonyms: notice |
| notion | (noun) (usually plural) small personal articles or clothing or sewing items | - |
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| (noun) a general inclusive concept | - |
| (noun) an odd or fanciful or capricious idea | Synonyms: whim, whimsey, whimsy |
| (noun) a vague idea in which some confidence is placed | Synonyms: belief, feeling, impression, opinion |
| notochord | (noun) a flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates | - |
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| notoriety | (noun) the state of being known for some unfavorable act or quality | Synonyms: ill fame |
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| notornis | (noun) flightless New Zealand birds similar to gallinules | Synonyms: Notornis mantelli, takahe |
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| notturno | (noun) a pensive lyrical piece of music (especially for the piano) | Synonyms: nocturne |
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| nucleoprotein | (noun) any of several substances found in the nuclei of all living cells; consists of a protein bound to a nucleic acid | - |
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| nucleotide | (noun) a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA) | Synonyms: base |
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| ocelot | (noun) nocturnal wildcat of Central America and South America having a dark-spotted buff-brown coat | Synonyms: Felis pardalis, panther cat |
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| ocotillo | (noun) desert shrub of southwestern United States and Mexico having slender naked spiny branches that after the rainy season put forth foliage and clusters of red flowers | Synonyms: coachwhip, Fouquieria splendens, Jacob's staff, vine cactus |
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| oculomotor | (noun) supplies extrinsic muscles of the eye | Synonyms: nervus oculomotorius, oculomotor nerve, third cranial nerve |
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| offshoot | (noun) a natural consequence of development | Synonyms: branch, offset, outgrowth |
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| oilcloth | (noun) cloth treated on one side with a drying oil or synthetic resin | - |
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| oligonucleotide | (noun) (biochemistry) a polynucleotide whose molecules contain relatively few nucleotides | Synonyms: oligo |
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| omnipotence | (noun) the state of being omnipotent; having unlimited power | - |
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| ootid | (noun) mature ovum after penetration by sperm but before the formation of a zygote | - |
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| opisthotonos | (noun) severe spasm in which the back arches and the head bends back and heels flex toward the back | - |
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| orchotomy | (noun) surgical incision into the testis to obtain material for analysis (as in cases of abnormally low sperm count) | - |
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| orrisroot | (noun) fragrant rootstock of various irises especially Florentine iris; used in perfumes and medicines | Synonyms: orris |
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| osteotomy | (noun) surgical sectioning of bone | - |
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| otalgia | (noun) an ache localized in the middle or inner ear | Synonyms: earache |
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