one-half

• one half

one-half (uncountable)

1. One of two equal parts (1/2, ½, 0.5).
   • 1988 August 30, Malcolm W. Browne, “Intellectual Duel: Brash Challenge, Swift Response”, in The New York Times‎^[1]:

     As the series is extended to ever higher numbers, the fraction fluctuates among values a little greater than or equal to one-half, but the general trend moves closer and closer to exactly one-half.

• “one-half”, in OneLook Dictionary Search.
• "one-half" in WordNet 3.1, Princeton University, 2011.
• one-half of, one half of at the Google Books Ngram Viewer.

• half-one