/ Dictionary / Index I IAS: Meaning and Definition of Find definitions for: IAS Pronunciation: [key] indicated air speed. Institute for Advanced Studies. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ias (Thesaurus) iarovize Iaşi Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language