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j

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Symbol.
Mathematics. a unit vector on the y-axis of a coordinate system.
Engineering. the imaginary number .
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Other definitions for j (2 of 5)

J1

or j

[ 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.

Other definitions for j (3 of 5)

J2

abbreviation
Physics. joule; joules.Also j

Other definitions for j (4 of 5)

J3

Symbol.
the tenth in order or in a series.
(sometimes lowercase) the medieval Roman numeral for 1.Compare Roman numerals.

Other definitions for j (5 of 5)

J.

abbreviation
Cards. Jack.
Journal.
Judge.
Justice.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use j in a sentence

British Dictionary definitions for j (1 of 3)

j

symbol for
maths the unit vector along the y -axis
Also called: i obsolete the imaginary number √–1

British Dictionary definitions for j (2 of 3)

j

J

/ (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)

J

symbol for
cards jack
joule(s)
current density
abbreviation for
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

Scientific definitions for j

J

Abbreviation of joule
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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