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4 definitions found
 for J
From The Collaborative International Dictionary of English v.0.48 :

  J \J\ (j[=a]).
     J is the tenth letter of the English alphabet. It is a later
     variant form of the Roman letter I, used to express a
     consonantal sound, that is, originally, the sound of English
     y in yet. The forms J and I have, until a recent time, been
     classed together, and they have been used interchangeably.
     [1913 Webster]
     Note: In medical prescriptions j is still used in place of i
           at the end of a number, as a Roman numeral; as, vj,
           xij. J is etymologically most closely related to i, y,
           g; as in jot, iota; jest, gesture; join, jugular, yoke.
           See I. J is a compound vocal consonant, nearly
           equivalent in sound to dzh. It is exactly the same as g
           in gem. See Guide to Pronunciation, [sect][sect] 179,
           211, 239.
           [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: a unit of electrical energy equal to the work done when a
           current of one ampere passes through a resistance of one
           ohm for one second [syn: joule, J, watt second]
      2: the 10th letter of the Roman alphabet [syn: J, j]

From The Free On-line Dictionary of Computing (30 December 2018) :

     A derivative and redesign of APL with added features and
     control structures.  J is purely functional with lexical
     scope and more conventional control structures, plus several
     new concepts such as function rank and function arrays.  J
     was designed and developed by Kennneth E. Iverson and Roger
     Hui .  J uses only the ASCII
     character set but has a spelling scheme that retains the
     advantages of APL's special alphabet.  J is a conventional
     procedural programming language but can be used as a purely
     functional language.
     Version 4.1 for MS-DOS, Sun, Mac, Archimedes.  Source
     available in C from Iverson Software, +1 (416) 925 6096.
     Version 6 package from ISI includes an interpreter and
     tutorial.  Ported to DEC, NeXT, SGI, Sun-3, Sun-4,
     Vax, RS/6000, MIPS, Macintosh, Acorn Archimedes,
     IBM PC, Atari, 3b1, Amiga.
     J-mode GNU Emacs macros available by
     ["APL\?", Roger K.W. Hui et al, APL90 Conf Proc, Quote Quad

From The Devil's Dictionary (1881-1906) :

  J is a consonant in English, but some nations use it as a vowel --
  than which nothing could be more absurd.  Its original form, which has
  been but slightly modified, was that of the tail of a subdued dog, and
  it was not a letter but a character, standing for a Latin verb,
  _jacere_, "to throw," because when a stone is thrown at a dog the
  dog's tail assumes that shape.  This is the origin of the letter, as
  expounded by the renowned Dr. Jocolpus Bumer, of the University of
  Belgrade, who established his conclusions on the subject in a work of
  three quarto volumes and committed suicide on being reminded that the
  j in the Roman alphabet had originally no curl.

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