Source : Webster's Revised Unabridged Dictionary (1913)

Implicit \Im*plic"it\, a. [L. implicitus, p. p. of implicare to
   entwine, entangle, attach closely: cf. F. implicite. See
   {Implicate}.]
   1. Infolded; entangled; complicated; involved. [Obs.]
      --Milton.

            In his woolly fleece I cling implicit. --Pope.

   2. Tacitly comprised; fairly to be understood, though not
      expressed in words; implied; as, an implicit contract or
      agreement. --South.

   3. Resting on another; trusting in the word or authority of
      another, without doubt or reserve; unquestioning;
      complete; as, implicit confidence; implicit obedience.

            Back again to implicit faith I fall.  --Donne.

   {Implicit function}. (Math.) See under {Function}.

Source : WordNet®

implicit
     adj 1: implied though not directly expressed; inherent in the
            nature of something; "an implicit agreement not to
            raise the subject"; "there was implicit criticism in
            his voice"; "anger was implicit in the argument"; "the
            oak is implicit in the acorn" [syn: {inexplicit}]
            [ant: {explicit}]
     2: being without doubt or reserve; "implicit trust" [syn: {unquestioning}]