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1. Music See semitone.
2. A marching step of 15 inches (38 centimeters) at quick time and 18 inches (46 centimeters) at double time.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
2. Mil. a step 15 in. (38 cm) long in quick time and 18 in. (46 cm) long in double time.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.