/ Dictionary / Index A acoustical surveillance: Meaning and Definition of Find definitions for: acous'tical surveil'lance Pronunciation: [key] the collecting or recording of information by sound-detection methods and devices, as for intelligence purposes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acoustical cloud acoustical tile 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