IPA: /kæˈsɛt/
KK: /kæˈsɛt/
A small flat container that holds magnetic tape for recording sound or video, or film for photography.
I found an old cassette of my favorite music in the attic.
Cassette comes from the French word 'caisse' (meaning box) with the diminutive suffix '-ette' (meaning small). Thus, 'cassette' refers to a small box or container, originally used for holding items like tapes or films.
Think of a small 'box' ('caisse') for holding things — that's why a cassette is a small container for audio or video.