/ Dictionary / Index H half step: Meaning and Definition of Find definitions for: half' step" Pronunciation: [key] semitone. a step 15 in. (38 cm) long in quick time and 18 in. (46 cm) long in double time. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. half-staff half story Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language