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1. of or related to sound, the sense of hearing, or acoustics
2. designed to respond to, absorb, or control sound
3. (of a musical instrument or recording) without electronic amplification
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Relating to, containing, producing, arising from, actuated by, or carrying sound.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The qualifying adjectives acoustic and acoustical have the following meanings: arising from, actuated by, containing, producing, or related to sound. In general, acoustic is used when the term being qualified designates something that has the properties, dimensions, or physical characteristics associated with sound waves; acoustical is used when the term being qualified does not explicitly designate something that has the properties, dimensions, or physical characteristics of sound (e.g., acoustical engineering). However, sometimes these two terms are used interchangeably.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
Associated with sound at frequencies that are audible to human beings.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved