acoustic

acous|tic /ək'uːstɪk/ (acoustics)
1 [ADJ] ADJ n
An acoustic guitar or other instrument is one whose sound is produced without any electrical equipment.
acoustically [ADV] oft ADV with cl
...acoustically based music.
2 [N-COUNT]
If you refer to the acoustics or the acoustic of a space, you are referring to the structural features which determine how well you can hear music or speech in it.
acoustically [ADV] ADV adj
The church is acoustically perfect.
3 [N-UNCOUNT]
Acoustics is the scientific study of sound.
4 [ADJ] ADJ n
Acoustic means relating to sound or hearing. Compare aural.
...acoustic signals.

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