- (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.