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Definition of J: 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.

Synonyms:

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