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half (EN)
noun, adjective, adverb, preposition

noun “half”

singular half, plural halves
  1. one part when something is divided into two similar parts
    She gave me half of her sandwich.
  2. one of the two areas of a sports field, each used by one of the teams at the beginning of a game
    The team switched sides and played in the other half after halftime.
  3. the number 1/2
    When you add a half to a quarter, you get 3/4.
  4. (Britain) a half a pint (of beer or cider)
    I'll have a half of cider, please.
  5. (in telling time, followed by "past") thirty minutes after the given hour
    The meeting starts at half past three in the afternoon.

adjective “half”

base form half, non-gradable
  1. describes something that is 50% of a whole
    The table is a half meter wide.
  2. not complete, not perfect
    She told a half truth to avoid getting into trouble.
  3. describes a brother or sister who shares only one parent with you
    I have a half sister who shares the same mother as me.

adverb “half”

half (more/most)
  1. only done or filled to the extent of a half
    The bottle was half full.
  2. not completely, not perfectly
    She was only half listening to the lecture.

preposition “half”

half
  1. (UK, used without "past") thirty minutes after a given hour
    I'll meet you at half seven (i.e.. 7:30) for dinner.