Of which there are two in a year; semiannual; biyearly.

Twice in a year; semiannually.

Alternative spelling of half brother

A female sibling sharing a single parent.

A male sibling sharing a single parent, as distinguished from a full brother or brother-german, from a step-brother, or from a brother-like figure such as a blood brother.

Alternative spelling of half sister

(transitive, Cockney rhyming slang) To pinch, to steal.

A unit of volume used for liquids equal to half of a pint. / Half a pint of beer or other drink. / (colloquial) A small or short person. / (colloquial) A small child.

A half-brother of one's parent. / A half brother-in-law of one's parent.

The lowered position, half the height of a mast, at which a flag is flown when mourning, especially expressing respect for the dead. / (by extension) The lowered position of any thing.