enharmonic

Meanings

1. Describing two or more identical or almost identical notes that are written differently when in different keys. (Whether they are identical and what the exact equivalences are depends on the tuning used.)
2. Of or pertaining to a tetrachord.

Etymology

From Latin enharmonicus, from Late Latin enarmonius, from Ancient Greek ἐναρμόνιος (enarmónios), from ἐν (en)+ἁρμονία (harmonía).