from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Referring to a sound that has no visually identifiable cause.
- adj. Referring to Pythagorean disciples who for years listened to his lectures from behind a curtain, unable to see him.
- adj. Referring to pre-recorded music that is presented in concert using loudspeakers, e.g. some types of computer music.
from The Century Dictionary and Cyclopedia
- Hearing; listening: as, acousmatic disciples.
- n. A name given to such of the disciples of the Greek philosopher Pythagoras as had not completed their years of probation; hence, a professed hearer; a probationer.
- n. An equivalent form is acoustic.
From Latin acousmaticus, from Ancient Greek ἀκουσματικός (akousmatikos), from ἀκούω (akouō, "I hear"). (Wiktionary)