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J, j

[jey] /dʒeɪ/
noun, plural 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.

j

Symbol.
1.
Mathematics. a unit vector on the y-axis of a coordinate system.
2.
Engineering. the imaginary number .

J

1.
2.
Physics. joule; joules.
Also, j.

J

Symbol.
1.
the tenth in order or in a series, or, when I is omitted, the ninth.
2.
(sometimes lowercase) the medieval Roman numeral for 1.
Compare Roman numerals.

J.

1.
Cards. Jack.
2.
3.
4.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for j
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British Dictionary definitions for j

j

symbol
1.
(maths) the unit vector along the y-axis
2.
(obsolete) Also called i. the imaginary number √–1

j

/dʒeɪ/
noun (pl) j's, J's, Js
1.
the tenth letter and seventh consonant of the modern English alphabet
2.
a speech sound represented by this letter, in English usually a voiced palato-alveolar affricate, as in jam

J

symbol
1.
(cards) jack
2.
joule(s)
3.
current density
abbreviation
4.
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
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Word Origin and History for j

J

the letter is a late modification of Roman -i-, originally a scribal creation in continental Medieval Latin to distinguish small -i- in cursive writing from the strokes of other letters, especially in the final positions of words. But in English, -y- was used for this, and -j- was introduced c.1600-1640 to take up the consonantal sound that had evolved from -i- since Late Latin times. This usage first was attested in Spanish, where it was in place before 1600. English dictionaries continued to lump together words beginning in -i- and -j- until 19c., and -j- formerly was skipped when letters were used to express serial order.

Used in modern writing to represent Latin -i- before a, e, o, u in the same syllable, which in Latin was sounded as the consonant in Modern English you, yam, etc., but the custom is controversial among Latinists:

The character J, j, which represents the letter sound in some school-books, is an invention of the seventeenth century, and is not found in MSS., nor in the best texts of the Latin authors. [Lewis]

Online Etymology Dictionary, © 2010 Douglas Harper
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j in Medicine

J abbr.
joule

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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j in Science
J  
Abbreviation of joule
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang definitions & phrases for j

J

noun

(also jay or jay smoke or J smoke) A marijuana cigarette; joint

[1960s+ Narcotics; fr the J of Mary Jane, ''marijuana,'' or the j of joint]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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