Meaning of halfhourly

half•hour•ly

Pronunciation: (haf'our'lē, -ou'ur-, häf'-), [key]
— adj.
  1. half-hour (def. 3).
  2. occurring every half-hour: a halfhourly interruption.
—adv.
  1. at half-hour intervals: The bell rang halfhourly.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.