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op·tion·al adjective : involving an option : not compulsory

Synonyms

discretionary, elective, voluntary; also alternative, chosen; dispensable, unwanted

Antonyms

compulsory, mandatory, nonelective, obligatory, required

op·tom·e·try noun : the health-care profession concerned esp. with examining the eyes for defects of vision and with prescribing corrective lenses or eye exercises

— op·tom·e·trist noun

opt out verb : to choose not to participate

op·u·lence noun 1 : abundance of valuable material possessions or resources : WEALTH

2 : ABUNDANCE

Synonyms

assets, capital, fortune, means, riches, substance, wealth, wherewithal—more at WEALTH

op·u·lent adjective 1 : exhibiting or characterized by opulence

2 : richly abundant

Synonyms

deluxe, lavish, luxuriant, luxurious, palatial, plush, sumptuous—more at LUXURIOUS

affluent, flush, loaded, moneyed, rich, wealthy, well-heeled, well-to-do—more at RICH

op·u·lent·ly adverb : with opulence : in an opulent manner

Synonyms

expensively, extravagantly, grandly, high, lavishly, luxuriously, richly—more at HIGH

opus noun, plural opera also opus·es : something produced by the exercise of creative talent or expenditure of creative effort; especially : a musical composition

Synonyms

composition, piece, work—more at COMPOSITION

or conjunction — used as a function word to indicate an alternative

OR abbreviation 1 operating room

2 Oregon

-or noun suffix : one that does a (specified) thing

or·a·cle noun 1 : one held to give divinely inspired answers or revelations

2 : an authoritative or wise utterance; also : a person of great authority or wisdom

— orac·u·lar adjective

1oral adjective 1 : uttered by the mouth or in words

2 : of, given through, or involving the mouth

3 : of, relating to, or characterized by the first stage of psychosexual development in psychoanalytic theory in which libidinal gratification is derived from intake (as of food), by sucking, and later by biting

4 : relating to or characterized by personality traits of passive dependency and aggressiveness

— oral·ly adverb

Synonyms

vocal, voiced—more at VOCAL

spoken, unwritten, verbal—more at VERBAL

2oral noun : an oral examination — usu. used in pl.

oral sex noun : oral stimulation of the genitals : CUNNILINGUS, FELLATIO

orang noun : ORANGUTAN

or·ange noun 1 : a juicy citrus fruit with reddish yellow rind; also : an evergreen tree with fragrant white flowers that bears this fruit

2 : a color between red and yellow

or·ange·ade noun : a beverage of orange juice, sugar, and water

orange hawkweed noun : a weedy herb related to the daisies with bright orange-red flower heads

or·ange·ry noun, plural -ries : a protected place (as a greenhouse) for raising oranges in cool climates

orang·utan noun [ORIGIN: Bazaar Malay (Malay-based pidgin), fr. Malay orang man + hutan forest]

: a large reddish brown tree-living anthropoid ape of Borneo and Sumatra

orate verb orat·ed; orat·ing : to speak in a declamatory manner

Synonyms

declaim, discourse, harangue, lecture, mouth, speak, talk; also rant, rave; preach; advertise, announce, broadcast, declare, proclaim, pronounce

ora·tion noun : an elaborate discourse delivered in a formal and dignified manner

Synonyms

address, declamation, harangue, speech, talk—more at SPEECH

or·a·tor noun : one noted for skill and power as a public speaker

or·a·tor·i·cal adjective : of, relating to, or characteristic of an orator or oratory; also : of or relating to an inflated style of speech or writing

— or·a·tor·i·cal·ly adverb

Synonyms

bombastic, gaseous, grandiloquent, rhetorical, windy—more at RHETORICAL

or·a·to·rio noun, plural -rios : a lengthy choral work usu. on a scriptural subject

1oratory noun, plural -ries : a private or institutional chapel

2oratory noun 1 : the art of speaking eloquently and effectively in public

2 : the substance of oratorical speech

orb noun : a spherical