What is the meaning of half?

noun

• One of two equal parts of a divisible whole.
  • usage: "half a loaf"; "half an hour"; "a century and one half"
  • synonyms: one-half
• One of two divisions into which some games or performances are divided: the two divisions are separated by an interval.

adjective

• Consisting of one of two equivalent parts in value or quantity.
  • usage: "a half chicken"; "lasted a half hour"
• Partial.
  • usage: "gave me a half smile"; "he did only a half job"
• Of siblings. ( related through one parent only)
  • usage: "a half brother"; "half sister"

adverb

• Partially or to the extent of a half.
  • usage: "he was half hidden by the bushes"