• (of a sibling) Having one parent (rather than two) in common.

    "A half brother or half sister"

  • Consisting of some indefinite portion resembling a half; approximately a half, whether more or less; partial; imperfect.

    "a half dream; half knowledge"

  • (Britain, time) Half an hour after the time given; half past.

    "We went to bed at half ten."

  • Consisting of a moiety, or half (1/2, 50%).

    "a half bushel; a half hour; a half dollar; a half view"

  • (rare, of a relative other than a sibling) Related through one common grandparent or ancestor rather than two.

    "A half uncle or half aunt or half cousin"


  • In two equal parts or to an equal degree; in some part approximating a half; partially; imperfectly

    "half-colored; half done; half-hearted; half persuaded; half conscious"


  • (preceded by “a” or a number) The fraction obtained by dividing 1 by 2.

    "Three-quarters minus a quarter is a half."

  • Half of a standard measure; frequently used (Britain) for half a pint of beer or cider.
  • Any of the three terms at Eton College, for Michaelmas, Lent, and summer.
  • (sports) One of the two opposite parts of the playing field of various sports, in which each starts the game.
  • (obsolete) part; side; behalf
  • One of two usually roughly equal parts into which anything may be divided, or considered as divided; — sometimes followed by of; as, a half of an apple.

    "You don't know the half of it."


  • (Britain, Ireland) a half-hour after, thirty minutes after (used with the number of the hour)

    "half one — half past one, 1:30"


  • (transitive, obsolete) To halve.

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