J, j

WordReference Random House Learner's Dictionary of American English © 2025

J, j /dʒeɪ/   n., pl. Js or J's, js or j's. 

1. the tenth letter of the English alphabet, a consonant.

J,  Symbol.

J or j, an abbreviation of:

1. Physics joule.

J.,  an abbreviation of:

1. Journal.
2. Judge.
3. Justice.

WordReference Random House Unabridged Dictionary of American English © 2025

J, j  ( jā), 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 aJ.
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.

J, 

1. Jewish.
2. Physics Also, j 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. Games [Cards.] Jack.
2. Journal.
3. Judge.
4. Justice.