Definition: not

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Source: WordNet (r) 1.7 

not
     adv : negation of a word or group of words; "he does not speak
           French"; "she is not going"; "they are not friends";
           "not many"; "not much"; "not at all"

Source: Webster's Revised Unabridged Dictionary (1913) 

Not \Not\ [Contr. from ne wot. See 2d Note.]
   Wot not; know not; knows not. [Obs.] --Chaucer.
Not \Not\, a.
   Shorn; shaven. [Obs.] See Nott.
Not \Not\, adv. [OE. not, noht, nought, naught, the same word as
   E. naught. See Naught.]
   A word used to express negation, prohibition, denial, or
   refusal.

         Not one word spake he more than was need. --Chaucer.

         Thou shalt not steal.                    --Ex. xx. 15.

         Thine eyes are upon me, and I am not.    --Job vii. 8.

         The question is, may I do it, or may I not do it? --Bp.
                                                  Sanderson.

   Not . . . but, or Not but, only. [Obs. or Colloq.]
      --Chaucer.

Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

NOT

   <logic> The Boolean function which is true only if its input
   is false.  Its truth table is:

    A | NOT A
    --+----------
    F |   T
    T |   F

   (1996-11-04)