/ Dictionary / Index A audion: Meaning and Definition of Find definitions for: au•di•on Pronunciation: (ô'dē-un, -on"), [key] — n. Electronics. an early type of triode. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. audiometry audiophile Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language