Source : Webster's Revised Unabridged Dictionary (1913)

Negligible \Neg"li*gi*ble\, a. [Cf. F. n['e]gligible,
   n['e]gligeable.]
   That may neglicted, disregarded, or left out of
   consideration.

         Within very negligible limits of error.  --Sir J.
                                                  Herschel.

Source : WordNet®

negligible
     adj 1: so small as to be meaningless; insignificant; "the effect
            was negligible"
     2: not worth considering; "he considered the prize too paltry
        for the lives it must cost"; "piffling efforts"; "a
        trifling matter" [syn: {paltry}, {trifling}]