Definitions for half step
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Random House Webster's College Dictionary
half′ step`(n.)
Category: Music and Dance
Ref: semitone
Mil. a step 15 in. (38 cm) long in quick time and 18 in. (46 cm) long in double time.
Category: Military
Origin of half step:
1900–05
Princeton's WordNet
semitone, half step(noun)
the musical interval between adjacent keys on a keyboard instrument
Wiktionary
half step(Noun)
An interval of which there are seven in a fifth or twelve in an octave, consisting of two tones whose frequency ratio is about 1.059 or 18/17.
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