(used with a singular verb) Physics. the branch of physics that deals with sound and sound waves.
(used with a plural verb) the qualities or characteristics of a room, auditorium, stadium, etc., that determine the audibility or fidelity of sounds in it.

1675–85; see acoustic, -ics

hyperacoustics, noun Unabridged


adjective Also, acoustical.
pertaining to the sense or organs of hearing, to sound, or to the science of sound.
(of a building material) designed for controlling sound.
of, pertaining to, or being a musical instrument whose sound is not electrically enhanced or modified.
arranged for or made up of such instruments: an acoustic solo; an acoustic group.
Obsolete. a remedy for deafness or imperfect hearing.

1595–1605; < Greek akoustikós. See acouasm, -tic

acoustically, adverb
nonacoustic, adjective, noun
nonacoustical, adjective
nonacoustically, adverb
unacoustic, adjective
unacoustical, adjective
unacoustically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acoustic or acoustical (əˈkuːstɪk)
1.  of or related to sound, the sense of hearing, or acoustics
2.  designed to respond to, absorb, or control sound: an acoustic tile
3.  (of a musical instrument or recording) without electronic amplification: an acoustic bass; an acoustic guitar
[C17: from Greek akoustikos, from akouein to hear]
acoustical or acoustical
[C17: from Greek akoustikos, from akouein to hear]
a'coustically or acoustical

acoustics (əˈkuːstɪks)
1.  (functioning as singular) the scientific study of sound and sound waves
2.  (functioning as plural) the characteristics of a room, auditorium, etc, that determine the fidelity with which sound can be heard within it

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, from Fr. acoustique, from Gk. akoustikos "pertaining to hearing," from akoustos "heard, audible," from akouein "to hear," from copulative prefix a- + koein "to mark, perceive, hear," from PIE base *(s)keu- "to notice, observe" (see caveat). Acoustic guitar (as opposed
to electric) attested by 1958.

1680s, "science of sound," from acoustic (also see -ics). Meaning "acoustic properties" of a building, etc., attested from 1885.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

acoustic a·cous·tic (ə-kōō'stĭk) or a·cous·ti·cal (-stĭ-kəl)
Of or relating to sound, the sense of hearing, or the perception of sound.

acoustics a·cous·tics (ə-kōō'stĭks)
The scientific study of sound, especially of its generation, transmission, and reception.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
acoustics   (ə-k'stĭks)  Pronunciation Key 

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  1. (Used with a singular verb) The scientific study of sound and its transmission.

  2. (Used with a plural verb) The total effect of sound, especially as produced in an enclosed space.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The effective use of implied sub-spaces, seating arrangements, lighting and
  acoustics was missing.
The rise of the science of acoustics supported the ever-increasing advancements
  in the art of music making.
Many use it to communicate, and almost all rely on acoustics to navigate a
  dark, often turbid world.
The stern face across the room, picking up on their confusion through a trick
  in the apartment's acoustics, broke into a smile.
Matching Quote
"As it grew later in the afternoon, and we rowed leisurely up the gentle stream, shut in between fragrant and blooming banks, where we had first pitched our tent, and drew nearer to the fields where our lives had passed, we seemed to detect the hues of our native sky in the southwest horizon. The sun was just setting behind the edge of a wooded hill, so rich a sunset as would never have ended but for some reason unknown to men, and to be marked with brighter colors than ordinary in the scroll of time. Though the shadows of the hills were beginning to steal over the stream, the whole river valley undulated with mild light, purer and more memorable than the noon. For so day bids farewell even to solitary vales uninhabited by man. Two herons (Ardea herodias), with their long and slender limbs relieved against the sky, were seen traveling high over our heads,—their lofty and silent flight, as they were wending their way at evening, surely not to alight in any marsh on the earth's surface, but, perchance, on the other side of our atmosphere, a symbol for the ages to study.... The last vestiges of daylight at length disappeared, and as we rowed silently along with our backs toward home through the darkness, only a few stars being visible, we had little to say, but sat absorbed in thought, or in silence listened to the monotonous sound of our oars, a sort of rudimental music, suitable for the ear of Night and the acoustics of her dimly lighted halls;
"Pulsae referunt ad sidera valles,"
and the valleys echoed the sound of the stars."
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