Interval from B to C or E to F (8)

I believe the answer is:

semitone

(Other definitions for semitone that I've seen before include "One twelfth of an octave" , "Interval between adjacent keys, on a piano say" , "Minimum interval in diatonic scale" , "Small interval between notes" , "Short musical interval" .)

I've seen this clue in The Guardian.

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