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Enharmonic equivalence

(in modern musical notation and tuning) note, interval, or key signature that is equivalent to some other note, interval, or key signature but "spelled", or named differently

Pronunciation
/ˌɛnhɑrˈmɑnɪk ɪˈkwɪvələns/
/ˌɛnhɑːˈmɒnɪk ɪˈkwɪvələns/