| 1 | English | acoustic | Pertaining to the sense of hearing, the organs of... |
| 2 | Medieval Latin | acousticus | — |
| 3 | Ancient Greek | ἀκουστῐκός | — |
| 4 | Ancient Greek | ἀκούω | I hear; I hear about, learn; I listen, pay... |
| 5 | Proto-Hellenic | akouhō | to hear |
| 6 | Proto-Indo-European | h₂ḱh₂owsyéti | to be sharp-eared, to hear well |
| 7 | Proto-Indo-European | h₂ṓws | ear |
| 8 | Proto-Indo-European | h₂ew- | to enjoy; to consume; to perceive, see, to be... |