acoustic

[[t]əku͟ːstɪk[/t]]

acoustics

1) ADJ: ADJ n An acoustic guitar or other instrument is one whose sound is produced without any electrical equipment.

Derived words:

acoustically [[t]əku͟ːstɪkli[/t]] ADV oft ADV with cl

It's a very exciting time, I think, to be writing 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.

In this performance, Rattle had the acoustic of the Symphony Hall on his side.

Derived words:

acoustically ADV ADV adj

The church is fully air-conditioned and 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.