noun

• One of two usually roughly equal parts into which anything may be divided, or considered as divided.
  "An association football match usually consists of two halves of 45 minutes each."
• One of two usually roughly equal parts into which anything may be divided, or considered as divided.
  "However, the hosts hit back and hit back hard, first replacement hooker Andrew Hore sliding over, then Williams careering out of his own half and leaving several defenders for dead before flipping the ball to Nonu to finish off a scintillating move."
• Half of a standard measure, chiefly:
  "He came back with a pint of Guinness for me and a half of bitter for Wendy."
• Half of a standard measure, chiefly:
  "Barrels came in firkins, nine gallons; kilderkins, eighteen gallons; halves, twenty-seven gallons; barrels, thirty-six gallons and hogsheads, fifty-four."

adj

• (of a sibling) Having one parent (rather than two) in common.
  "A half brother or half sister"
• (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"

verb

• (transitive, obsolete) To halve.

prep

• (UK, Ireland) Half past; a half-hour (30 minutes) after the last hour.
  "The time is 9:30; it is half nine."
• (rare, see usage notes) A half-hour to (preceding) the next hour.
  "In some countries, "half seven" means 6:30."