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Definition of J:

  1. is the tenth letter of the English alphabet. It is a later variant form of the Roman letter I, used to express a consonantal sound, that is, originally, the sound of English y in yet.


c, h, calorie, a, f, therm, kilowatt-hour, ABC's, watt second, atmosphere, quantum, aitch, d, joule, b, newton, electromagnetic spectrum, photon, g, e.