/ Dictionary / Index A acoustics: Meaning and Definition of Find definitions for: a•cous•tics Pronunciation: (u-k'stiks), [key] — n. the branch of physics that deals with sound and sound waves. the qualities or characteristics of a room, auditorium, stadium, etc., that determine the audibility or fidelity of sounds in it. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: acoustics (Thesaurus) acoustic resistance acoustic theodolite Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language