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English Dictionary

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 J J /ˈdʒeɪ/

noun

  1. The 10th letter of the Roman alphabet  ( J )
    the 10th letter of the Roman alphabet
  2. A unit of electrical energy equal to the work done when a current of one ampere passes through a resistance of one ohm for one second  ( J , joule , watt second )
    a unit of electrical energy equal to the work done when a current of one ampere passes through a resistance of one ohm for one second