/ Dictionary / Index A aestivate: Meaning and Definition of Find definitions for: aes•ti•vate Pronunciation: (es'tu-vāt" or, esp. Brit., ē'stu-), [key] — -vat•ed, -vat•ing. estivate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: aestivate (Thesaurus) aestival aet. Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language