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halfhourly

American

[haf-ouuhr-lee, -ou-er-, hahf-] / ˈhæfˈaʊər li, -ˈaʊ ər-, ˈhɑf- /

adjective

half-hour.
occurring every half-hour.

a halfhourly interruption.

adverb

at half-hour intervals.

The bell rang halfhourly.

Etymology

Origin of halfhourly

First recorded in 1800–10; half + hourly

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.