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See also: mj, mJ, and mj.

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TranslingualEdit

SymbolEdit

MJ

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

EnglishEdit

NounEdit

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 ...[1], ISBN 0520243102, 9780520243101 Invalid ISBN, page 283:
      Then when my sister was old enough, my mother taught the three of us how to play MJ [mah-jongg].