| 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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| 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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| 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 | - |
| 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 | (noun) an original creation (i.e., an audio recording) from which copies can be made | Synonyms: master, master copy |
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| (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 | - |
| 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 |
| 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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