MJ

See also: mj, mJ, and mj.

Translingual

Symbol

MJ

  1. (metrology) Symbol for the megajoule, an SI unit of work or energy equal to 106 joules.

English

Noun

MJ (uncountable)

  1. (slang) Initialism of Mary Jane; marijuana.
  2. Initialism of mahjong.
    • 2006, Judy Yung, Gordon H. Chang, H. Mark Lai, Chinese American voices: from the gold rush to the present ...‎, →ISBN Invalid ISBN, page 283:
      Then when my sister was old enough, my mother taught the three of us how to play MJ [mah-jongg].
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