/ Dictionary / Index A aviso: Meaning and Definition of Find definitions for: a•vi•so Pronunciation: (u-vī'zō), [key] — pl. -sos. a boat used esp. for carrying dispatches; dispatch boat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Avis avitaminosis Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language