Mathematics. a unit vector on the y-axis of a coordinate system.
Engineering. the imaginary number .
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Question 1 of 10
Definition for j (2 of 5)
[ jey ]
/ dʒeɪ /
noun, plural J's or Js, j's or js.
the tenth letter of the English alphabet, a consonant.
any spoken sound represented by the letter J or j, as in just, major, or rajah.
something having the shape of a J.
a written or printed representation of the letter J or j.
a device, as a printer's type, for reproducing the letter J or j.
Definition for j (3 of 5)
Physics. joule; joules.Also j
Definition for j (4 of 5)
the tenth in order or in a series, or, when I is omitted, the ninth.
(sometimes lowercase) the medieval Roman numeral for 1.
Compare Roman numerals.
Definition for j (5 of 5)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for j (1 of 3)
maths the unit vector along the y -axis
Also called: i obsolete the imaginary number √–1
British Dictionary definitions for j (2 of 3)
/ (dʒeɪ) /
noun plural j's, J's or Js
the tenth letter and seventh consonant of the modern English alphabet
a speech sound represented by this letter, in English usually a voiced palato-alveolar affricate, as in jam
British Dictionary definitions for j (3 of 3)
Japan (international car registration)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for j
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for j
Abbreviation of joule
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.