Definition of acoustic in English:

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Pronunciation: /əˈko͞ostik/


1Relating to sound or the sense of hearing: dogs have a much greater acoustic range than humans
More example sentences
  • Their underwater acoustic sense and echo-location skills are legendary.
  • The place has been designed with a great acoustic sense.
  • Quickly sensing the acoustic mismatch, the woman closes the bathroom door, muting the water sounds.
1.1(Of building materials) used for soundproofing or modifying sound: acoustic tiles
More example sentences
  • Hard, smooth surfaces are more sound-reflective than rough surfaces, or ones that are covered with fabric or acoustic materials.
  • Then open-web joists would be installed between the arch segments, and when these were completed acoustic metal decking was attached to the entire assembly.
  • Then you can start deciding things like where to place furniture and acoustic material, finding a good room that's not a hallway next to a jackhammer and so on.
1.2(Of an explosive mine or other weapon) able to be set off by sound waves.
Example sentences
  • Once this had been introduced, the Germans began to use acoustic mines which were detonated by the sound of a ship's propeller acting on a diaphragm within them.
  • This is the noise-maker for sweeping acoustic mines.
  • Agate generates the acoustic signature of any ship in order to trigger acoustic mines.
2(Of popular music or musical instruments) not having electrical amplification: a sad, gentle acoustic ballad old-fashioned acoustic instruments
More example sentences
  • I listen to as much acoustic music as electronic these days; I like to keep an open mind.
  • It's a beautiful album, and solo acoustic music doesn't get much better than this.
  • It's a total transition - he's gone from acoustic jazz into electric jazz-rock.


1 (usually acoustics) The properties or qualities of a room or building that determine how sound is transmitted in it: Symphony Hall has perfect acoustics
More example sentences
  • Wavy perforated metal panels aid the room's acoustics yet appear to float off of the brick walls.
  • However, the acoustics in that room where dreadful (very high ceiling), but Eric and Andre (2nd guitar and bass) did a good job and put on a good show.
  • His voice, as heard over the television, is not ideally modulated, but it was probably adapted to the acoustics in the room as he heard his own voice.
2 (acoustics) [treated as singular] The branch of physics concerned with the properties of sound.
Example sentences
  • Current advances in science and technology, particularly in the area of acoustics and high technologies, enable a more complete utilization of the audio band.
  • He studied mathematical physics and acoustics producing a major study in 1862 which looked at musical theory and the perception of sound.
  • Thus, the field of acoustics covers a vast array of different areas of use, and they are constantly expanding.
3A musical instrument without electrical amplification, typically a guitar.
Example sentences
  • I was about to knock on the door when I heard a snare hit, followed by a bass guitar, and an acoustic.
  • Both use guitars in, mostly, their original form to expose the dichotomy between the electronic and the acoustic.
  • Then he swaps to bass guitar or acoustic, Derek comes in on violin, Basil starts to sing.



Example sentences
  • The acoustical canopy hanging over the stage of San Francisco's Davies Symphony hall is made of 59 6-foot squares of Plexiglas.
  • A loud rock band was defined as ‘any group with more than three people without acoustical equipment other than drums.’
  • First, the acoustical problem was solved by giving the performers body mikes, with the audience listening on little portable headsets.


Pronunciation: /əˈko͞ostik(ə)lē/
Example sentences
  • The two hit it off, began collaborating on songs, and were signed after performing acoustically for various record labels.
  • The former Squeeze musician will also play acoustically as he headlines the New Variety Club, Russell Street, on February 20.
  • Having played these electric songs acoustically now, I think that for the first time ever the band is being given a degree of recognition that its never had before.


Mid 17th century: from Greek akoustikos, from akouein 'hear'.

For editors and proofreaders

Syllabification: a·cous·tic

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