/ Dictionary / Index O oasis: Meaning and Definition of Find definitions for: o•a•sis Pronunciation: (ō-ā'sis), [key] — pl. -ses a small fertile or green area in a desert region, usually having a spring or well. something serving as a refuge, relief, or pleasant change from what is usual, annoying, difficult, etc.: The library was an oasis of calm in the hectic city. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oasis (Thesaurus) O.A.S.I. oast Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language