| orgiastic | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanal, bacchanalian, bacchic, carousing |
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| (adjective) used of frenzied sexual activity | - |
| orgy | (noun) secret rite in the cults of ancient Greek or Roman deities involving singing and dancing and drinking and sexual activity | - |
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| (noun) any act of immoderate indulgence | Synonyms: binge, splurge |
| (noun) a wild gathering involving excessive drinking and promiscuity | Synonyms: bacchanal, bacchanalia, debauch, debauchery, drunken revelry, riot, saturnalia |
| oriel | (noun) a projecting bay window corbeled or cantilevered out from a wall | Synonyms: oriel window |
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| orient | (noun) the hemisphere that includes Eurasia and Africa and Australia | Synonyms: eastern hemisphere |
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| (verb) adjust to a specific need or market | Synonyms: tailor |
| (verb) familiarize (someone) with new surroundings or circumstances | - |
| (verb) determine one's position with reference to another point | Synonyms: orientate |
| (verb) be oriented | Synonyms: point |
| (verb) cause to point | - |
| oriental | (adjective) denoting or characteristic of countries of the Far East | - |
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| (adjective) denoting or characteristic of countries of Asia; 'oriental civilization' | - |
| orientalise | (verb) make oriental in character | Synonyms: orientalize |
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| orientalism | (noun) the quality or customs or mannerisms characteristic of Asian civilizations | - |
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| orientalist | (noun) a specialist in oriental subjects | - |
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| orientalize | (verb) make oriental in character | Synonyms: orientalise |
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| orientate | (verb) determine one's position with reference to another point | Synonyms: orient |
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| orientated | (adjective) adjusted or located in relation to surroundings or circumstances; sometimes used in combination | Synonyms: oriented |
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| orientating | (adjective) positioning with respect to a reference system or determining your bearings physically or intellectually | Synonyms: orienting |
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| orientation | (noun) the act of orienting | - |
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| (noun) a course introducing a new situation or environment | Synonyms: orientation course |
| (noun) an integrated set of attitudes and beliefs | - |
| (noun) a person's awareness of self with regard to position and time and place and personal relationships | - |
| (noun) a predisposition in favor of something | Synonyms: predilection, preference |
| (noun) position or alignment relative to points of the compass or other specific directions | - |
| oriented | (adjective) adjusted or located in relation to surroundings or circumstances; sometimes used in combination | Synonyms: orientated |
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| orienting | (adjective) positioning with respect to a reference system or determining your bearings physically or intellectually | Synonyms: orientating |
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| orifice | (noun) an aperture or hole that opens into a bodily cavity | Synonyms: opening, porta |
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| oriflamme | (noun) a red or orange-red flag used as a standard by early French kings | - |
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| (noun) an inspiring symbol or ideal that serves as a rallying point in a struggle | - |
| origami | (noun) the Japanese art of folding paper into shapes representing objects (e.g., flowers or birds) | - |
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| origanum | (noun) any of various fragrant aromatic herbs of the genus Origanum used as seasonings | - |
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| origin | (noun) properties attributable to your ancestry | Synonyms: descent, extraction |
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| (noun) the point of intersection of coordinate axes; where the values of the coordinates are all zero | - |
| (noun) an event that is a beginning; a first part or stage of subsequent events | Synonyms: inception, origination |
| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, bloodline, descent, line, line of descent, lineage, parentage, pedigree, stemma, stock |
| (noun) the place where something begins, where it springs into being | Synonyms: beginning, root, rootage, source |
| (noun) the source of something's existence or from which it derives or is derived | - |
| original | (adjective) being or productive of something fresh and unusual; or being as first made or thought of | - |
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| (adjective) (of e.g. information) not secondhand or by way of something intermediary | - |
| (adjective) not derived or copied or translated from something else | - |
| (adjective) preceding all others in time or being as first made or performed | - |
| (noun) an original creation (i.e., an audio recording) from which copies can be made | Synonyms: master, master copy |
| (noun) something that serves as a model or a basis for making copies | Synonyms: archetype, pilot |
| originalism | (noun) the belief that the United States Constitution should be interpreted in the way the authors originally intended it | - |
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| originality | (noun) the quality of being new and original (not derived from something else) | - |
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| (noun) the ability to think and act independently | - |
| originally | (adverb) in an manner suggesting originality | - |
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| (adverb) with reference to the origin or beginning | Synonyms: in the beginning, primitively |
| (adverb) before now | Synonyms: earlier, in the beginning, in the first place, to begin with |
| originate | (verb) bring into being | Synonyms: initiate, start |
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| (verb) come into existence; take on form or shape | Synonyms: arise, develop, grow, rise, spring up, uprise |
| (verb) begin a trip at a certain point, as of a plane, train, bus, etc. | - |
| origination | (noun) the act of starting something for the first time; introducing something new | Synonyms: creation, foundation, founding, initiation, innovation, instauration, institution, introduction |
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| (noun) an event that is a beginning; a first part or stage of subsequent events | Synonyms: inception, origin |
| originative | (adjective) having the ability or power to create | Synonyms: creative |
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| (adjective) containing seeds of later development | Synonyms: germinal, seminal |
| originator | (noun) someone who creates new things | Synonyms: conceiver, mastermind |
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| orinasal | (noun) a speech sound produced with both the oral and nasal passages open (as French nasal vowels) | Synonyms: orinasal phone |
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| oriole | (noun) American songbird; male is black and orange or yellow | Synonyms: American oriole, New World oriole |
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| (noun) mostly tropical songbird; the male is usually bright orange and black | Synonyms: Old World oriole |
| orison | (noun) reverent petition to a deity | Synonyms: petition, prayer |
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| orlop | (noun) the fourth or lowest deck | Synonyms: fourth deck, orlop deck |
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| ormer | (noun) an abalone found near the Channel Islands | Synonyms: Haliotis tuberculata, sea-ear |
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| ormolu | (noun) brass that looks like gold; used to decorate furniture | - |
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| ornament | (noun) something used to beautify | Synonyms: decoration, ornamentation |
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| (verb) make more attractive by adding ornament, colour, etc. | Synonyms: adorn, beautify, decorate, embellish, grace |
| (verb) be an ornament to | - |
| ornamental | (adjective) serving an esthetic rather than a useful purpose | Synonyms: cosmetic, decorative |
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| (noun) any plant grown for its beauty or ornamental value | - |
| ornamentalism | (noun) the practice of ornamental display | - |
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| ornamentalist | (noun) someone who decorates | Synonyms: decorator |
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| ornamentally | (adverb) in an ornamental, nonfunctional manner | - |
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| ornamentation | (noun) the act of adding extraneous decorations to something | Synonyms: embellishment |
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| (noun) something used to beautify | Synonyms: decoration, ornament |
| (noun) the state of being ornamented | - |
| ornate | (adjective) marked by elaborate rhetoric and elaborated with decorative details | Synonyms: flowery |
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| ornately | (adverb) in an ornate manner | - |
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| ornateness | (noun) an ornate appearance; being elaborately (even excessively) decorated | Synonyms: elaborateness |
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| (noun) high-flown style; excessive use of verbal ornamentation | Synonyms: grandiloquence, grandiosity, magniloquence, rhetoric |
| orneriness | (noun) meanspirited disagreeable contrariness | Synonyms: cussedness |
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| ornery | (adjective) having a difficult and contrary disposition | Synonyms: cantankerous, crotchety |
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| ornithine | (noun) an amino acid that does not occur in proteins but is important in the formation of urea | - |
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| ornithischian | (noun) herbivorous dinosaur with a pelvis like that of a bird | Synonyms: ornithischian dinosaur |
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| ornithological | (adjective) of or relating to ornithology | - |
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| ornithologist | (noun) a zoologist who studies birds | Synonyms: bird watcher |
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| ornithology | (noun) the branch of zoology that studies birds | - |
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| ornithomimid | (noun) lightly built medium-sized dinosaur having extremely long limbs and necks with small heads and big brains and large eyes | - |
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| ornithopod | (noun) bipedal herbivorous dinosaur | Synonyms: ornithopod dinosaur |
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| ornithopter | (noun) heavier-than-air craft that is propelled by the flapping of wings | Synonyms: orthopter |
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| ornithosis | (noun) an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds | Synonyms: parrot fever, psittacosis |
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| orogeny | (noun) the process of mountain formation (especially by the upward displacement of the earth's crust) | - |
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| orograph | (noun) A machine for use in making topographical maps. | - |
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| orography | (noun) the science of mountains | Synonyms: orology |
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| oroide | (noun) alloy of copper and tin and zinc; used in imitation gold jewelry | Synonyms: oreide |
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| orology | (noun) the science of mountains | Synonyms: orography |
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| oropharyngeal | (adjective) of or relating to or located near the oropharynx | - |
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| oropharynx | (noun) cavity formed by the pharynx at the back of the mouth | - |
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| orotund | (adjective) (of sounds) full and rich | Synonyms: pear-shaped, rotund, round |
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| (adjective) ostentatiously lofty in style | Synonyms: bombastic, declamatory, large, tumid, turgid |
| orphan | (noun) a young animal without a mother | - |
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| (noun) the first line of a paragraph that is set as the last line of a page or column | - |
| (noun) a child who has lost both parents | - |
| (noun) someone or something who lacks support or care or supervision | - |
| (verb) deprive of parents | - |
| orphanage | (noun) a public institution for the care of orphans | Synonyms: orphans' asylum |
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| (noun) the condition of being a child without living parents | Synonyms: orphanhood |
| orphaned | (adjective) deprived of parents by death or desertion | - |
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| orphanhood | (noun) the condition of being a child without living parents | Synonyms: orphanage |
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| orphenadrine | (noun) a skeletal muscle relaxant (trade name Norflex) used to treat severe muscle strain and Parkinsonism | Synonyms: Norflex |
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| orphic | (adjective) having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding | Synonyms: mysterious, mystic, mystical, occult, secret |
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| orphrey | (noun) a richly embroidered edging on an ecclesiastical vestment | - |
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| orpiment | (noun) a yellow mineral occurring in conjunction with realgar; an ore of arsenic | - |
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| orpin | (noun) perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers | Synonyms: live-forever, livelong, orpine, Sedum telephium |
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| orpine | (noun) perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers | Synonyms: live-forever, livelong, orpin, Sedum telephium |
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| orrery | (noun) planetarium consisting of an apparatus that illustrates the relative positions and motions of bodies in the solar system by rotation and revolution of balls moved by wheelwork; sometimes incorporated in a clock | - |
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| orris | (noun) German iris having large white flowers with lavender-tinged falls and a fragrant rhizome | Synonyms: Florentine iris, Iris florentina, Iris germanica florentina |
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| (noun) fragrant rootstock of various irises especially Florentine iris; used in perfumes and medicines | Synonyms: orrisroot |
| orrisroot | (noun) fragrant rootstock of various irises especially Florentine iris; used in perfumes and medicines | Synonyms: orris |
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| orthicon | (noun) a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons | Synonyms: image orthicon |
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| orthochorea | (noun) a form of chorea in which spasms occur mainly when the patient is erect | - |
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| orthoclase | (noun) a white or colored monoclinic feldspar | - |
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| orthodontia | (noun) the branch of dentistry dealing with the prevention or correction of irregularities of the teeth | Synonyms: dental orthopaedics, dental orthopedics, orthodontics, orthodonture |
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| orthodontic | (adjective) of or relating to or involving or practicing orthodontics | - |
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| orthodontics | (noun) the branch of dentistry dealing with the prevention or correction of irregularities of the teeth | Synonyms: dental orthopaedics, dental orthopedics, orthodontia, orthodonture |
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| orthodontist | (noun) a dentist specializing in the prevention or correction of irregularities of the teeth | - |
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| orthodonture | (noun) the branch of dentistry dealing with the prevention or correction of irregularities of the teeth | Synonyms: dental orthopaedics, dental orthopedics, orthodontia, orthodontics |
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| orthodox | (adjective) adhering to what is commonly accepted | - |
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| orthodoxy | (noun) the quality of being orthodox (especially in religion) | - |
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| (noun) a belief or orientation agreeing with conventional standards | - |
| orthoepist | (noun) a practitioner of orthoepy (especially one of the 17th or 18th century scholars who proposed to reform English spelling so it would reflect pronunciation more closely) | - |
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| orthoepy | (noun) a term formerly used for the part of phonology that dealt with the `correct' pronunciation of words and its relation to `correct' orthography | - |
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| (noun) the way a word or a language is customarily spoken | Synonyms: pronunciation |
| orthogonal | (adjective) not pertinent to the matter under consideration | Synonyms: extraneous, immaterial, impertinent |
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| (adjective) having a set of mutually perpendicular axes; meeting at right angles | Synonyms: rectangular |
| (adjective) statistically unrelated | - |
| orthogonality | (noun) the quality of lying or intersecting at right angles | - |
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| (noun) the relation of opposition between things at right angles | Synonyms: orthogonal opposition, perpendicularity |
| orthographic | (adjective) of or relating to or expressed in orthography | - |
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| orthography | (noun) a method of representing the sounds of a language by written or printed symbols | Synonyms: writing system |
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| orthomolecular | (adjective) designating or relating to a form of treatment of mental disorders that seeks to restore biochemical balance in the body with large doses of vitamins and minerals | - |
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| orthomyxovirus | (noun) a group of viruses including those causing influenza | - |
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| orthopaedic | (adjective) of or relating to orthopedics | Synonyms: orthopedic, orthopedical |
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| orthopaedics | (noun) the branch of medical science concerned with disorders or deformities of the spine and joints | Synonyms: orthopedics |
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| orthopaedist | (noun) a specialist in correcting deformities of the skeletal system (especially in children) | Synonyms: orthopedist |
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| orthopedic | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedical |
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| orthopedical | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedic |
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| orthopedics | (noun) the branch of medical science concerned with disorders or deformities of the spine and joints | Synonyms: orthopaedics |
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| orthopedist | (noun) a specialist in correcting deformities of the skeletal system (especially in children) | Synonyms: orthopaedist |
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