What does enharmonical mean?
Enharmonical is an adjective from music theory describing notes, intervals, or keys that differ in their written names but sound identical in pitch. In the standard twelve-tone equal temperament used on the modern piano, F sharp and G flat are produced by pressing exactly the same key, making them enharmonically equivalent even though theory treats them as distinct notes suited to different musical contexts. The term also applies to intervals that measure the same size acoustically yet carry different theoretical labels, and to modulations that exploit this equivalence — an enharmonic pivot can smoothly recast one chord as another in a distant key. The shorter form 'enharmonic' dominates contemporary usage, leaving 'enharmonical' sounding slightly old-fashioned, but both convey the same idea. For anyone studying harmony, keyboard geography, or notation, the concept is essential: it explains why composers choose one spelling over another and why certain key changes feel seamless rather than abrupt.
adjectiveRelating to or involving notes that sound the same in pitch but are written differently, such as F sharp and G flat. Also used more broadly of intervals that are equal in tuning but differ in theoretical naming.
- (Music) Of two notes, spellings, or keys: differing in written name but identical in actual pitch under equal temperament, such as C sharp and D flat.
- (Music, of an interval) Equal in size when measured in cents but classified differently in traditional theory, such as the enharmonic unison between G sharp and A flat.
"In twelve-tone equal temperament, F sharp and G flat are enharmonically identical, though a composer may still choose one spelling over the other for clarity."
"The passage modulates through an enharmonic pivot, reinterpreting A flat major as G sharp minor."
"Pianists treat the black key between F and G as either F sharp or G flat; the two names are enharmonically equivalent."
Thanks to modern piano tuning, the note you call F sharp is literally the same sound as G flat — and 'enharmonical' is the fancy word musicians use to admit it.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of enharmonical
Enharmonical derives from Greek roots: the prefix en- ('in') combined with harmonia ('harmony, joining'), originally referring to one of the ancient Greek tetrachord genera. The word entered English in the early modern period alongside the revival of classical music theory, first describing ancient Greek tuning before narrowing to its modern sense of notes identical in pitch despite different names. It shares its root with 'harmony', 'harmonic', and 'harmonious', all tracing back to the same Greek harmonia.
Related word forms
How enharmonical is actually used
The form 'enharmonic' is considerably more common in modern musical writing than 'enharmonical', which now sounds somewhat dated or formal. The term belongs to technical music theory and rarely appears outside discussions of tuning, notation, or harmony.
Easily confused with enharmonical
Harmonic refers to frequencies that are whole-number multiples of a fundamental tone, while enharmonical concerns two differently named notes that share the same actual pitch.