Acoustic means to do with sound, or played without electrical amplification. An acoustic guitar, acoustic panels, the acoustics of the hall.
In music it means unplugged, and an acoustic set is a familiar format. The plural acoustics means how a room handles sound, and a hall with poor acoustics cannot be fixed by turning anything up. The Greek behind it means of hearing.
1adjectiveacousticTo do with sound, or played without electrical amplification.
“He played an acoustic guitar by the campfire.”
acoustic is a quality.
Greek akoustikos means of or for hearing, from akouein, to hear.
Medieval Latin
acousticus
English, today
acoustic
Borrowed from Medieval Latin acousticus. Borrowed from Medieval Latin acousticus, acūsticus, from Ancient Greek ἀκουστῐκός (“of or for hearing”), from ἀκούω + -ῐκός.
Etymology from Wiktionary, CC BY-SA