/ Dictionary / Index A acidity: Meaning and Definition of Find definitions for: a•cid•i•ty Pronunciation: (u-sid'i-tē), [key] — n. the quality or state of being acid. sourness; tartness. excessive acid quality, as of the gastric juice. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: acidity (Thesaurus) acidimetry acidize Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language