Found 2 items, similar to on-key.
English → English (WordNet) Definition: on-key on-key adj : in tune; accurate in pitch; “a true note” [syn: true]
English → English (gcide) Definition: on-key on-key \on-key\ adj. (Music) In tune; striking or singing the proper notes. Opposite of off-key. Syn: true. [WordNet 1.5]