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half-hourly
Variant of half-hour
noun
- 30 minutes
- the point 30 minutes after any given hour
adjective
- lasting for 30 minutes
- occurring every 30 minutes
Related Forms:
- half-hourly adjective, adverb
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.