half-hour

• half hour

half- +‎ hour

half-hour (plural half-hours)

1. A period of time equal to thirty minutes, half an hour.
2. The time of thirty minutes past any particular hour.
   • 1807, [Miss Guion], chapter V, in The Three Germans. Mysteries Exemplified in the Life of Holstein of Lutztein. A German Romance. […], volume I, London: […] J[ames] F[letcher] Hughes, […], →OCLC, page 121:

     The great clock of the castle sounded the half-hour—he had another half-hour to wait, ere the approach of Count Deckendorff; […]

     Used in both senses.

• (a thirty minute period of time): half an hour

• half-hourly