Dictionary  JjPronunciation: ( jā), [key] —n., —pl. J's or Js, j's or js. 1. the tenth letter of the English alphabet, a consonant. 2. any spoken sound represented by the letter J or j, as in just, major, or rajah. 3. something having the shape of a J. 4. a written or printed representation of the letter J or j. 5. a device, as a printer's type, for reproducing the letter J or j. J1. Jewish. 2. Also,j Physics.joule; joules. J—Symbol. 1. the tenth in order or in a series, or, when I is omitted, the ninth. 2. (sometimes l.c.) the medieval Roman numeral for 1. Cf. Roman numerals. j—Symbol. 1. Math.a unit vector on the y-axis of a coordinate system. 2. Engin.the imaginary number &minus1sqrootover;. J.1. Cards.Jack. 2. Journal. 3. Judge. 4. Justice. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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