n One of two usually roughly equal parts into which anything may be divided, or considered as divided.
n (sports) One of the two opposite parts of the playing field of various sports, in which each starts the game.
n Half of a standard measure, chiefly: (Britain) half a pint of beer or cider. (Refusing a pint) Just a half, thank you. (Offering to top up a pint glass) Do you want a half in that? (Minimizing the amount of drink taken) A swift half at the Pear Tree.
n (preceded by “a” or a number) The fraction obtained by dividing 1 by 2.
n Any of the three terms at Eton College, for Michaelmas, Lent, and summer.
n (slang) A half sibling.
n (UK, dated) A child ticket. Two and a half to Paddington.
n (sports) abbreviated form for half marathon.
adj Consisting of a half (½, 50%).
adj Consisting of some indefinite portion resembling a half; approximately a half, whether more or less; partial; imperfect.
adj (of a sibling) Having one parent (rather than two) in common.
adj (of a relative other than a sibling) Related through one common grandparent or ancestor rather than two.
adv In two equal parts or to an equal degree.
adv In some part approximating a half.
adv Partially; imperfectly.
adv Practically, nearly.
v (transitive, obsolete) To halve.
n (numismatic slang) Clipping of half-dollar. [A coin worth one half of a dollar, typically 50 cents.]