Noun j has 2 senses
  1. joule, J, 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
    --1 is a kind of work unit, heat unit, energy unit
    --1 has parts: erg
  2. J - the 10th letter of the Roman alphabet
    --2 is a kind of
    letter, letter of the alphabet, alphabetic character
    --2 is a member of Roman alphabet, Latin alphabet
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