half step

Từ điển Oxford Advanced Learner 8th

ˈhalf step [half step] BrE NAmE (also ˈhalf-tone) (both NAmE) (BrE semi·tone) noun (music)
half a ↑tone on a musical ↑scale, for example the ↑interval between C and C♯ or between E and F
compare ↑step _n. (¹⁰)
See also: ↑half-tone ▪ ↑semitone