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The term pm, Pm or PM, when used by itself can refer to:

  1. pm is short for post meridiem, Latin for "after noon". This is used to define hours of the day: The meeting ends at 5 pm. The opposite of pm is am.
  2. In chemistry, in the periodic table, Pm is the chemical symbol for promethium.
  3. In electrical engineering, PM is short for phase modulation.
  4. In government, PM is short for prime minister.

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