Source : Webster's Revised Unabridged Dictionary (1913)

Intelligent \In*tel"li*gent\, a. [L. intelligens, intellegens,
   -entis, p. pr. of intelligere, intellegere, to perceive;
   inter between + legere to gather, collect, choose: cf. F.
   intelligent. See {Legend}.]
   1. Endowed with the faculty of understanding or reason; as,
      man is an intelligent being.

   2. Possessed of intelligence, education, or judgment;
      knowing; sensible; skilled; marked by intelligence; as, an
      intelligent young man; an intelligent architect; an
      intelligent answer.

   3. Gognizant; aware; communicate. [Obs.]

            Intelligent of seasons.               --Milton.

            Which are to France the spies and speculations
            Intelligent of our state.             --Shak.

   Syn: Sensible; understanding. See {Sensible}.

Source : WordNet®

intelligent
     adj 1: having the capacity for thought and reason especially to a
            high degree; "is there intelligent life in the
            universe?"; "an intelligent question" [ant: {unintelligent}]
     2: possessing sound knowledge; "well-informed readers" [syn: {well-informed}]
     3: exercising or showing good judgment; "healthy scepticism";
        "a healthy fear of rattlesnakes"; "the healthy attitude of
        French laws"; "healthy relations between labor and
        management"; "an intelligent solution"; "a sound approach
        to the problem"; "sound advice"; "no sound explanation for
        his decision" [syn: {healthy}, {levelheaded}, {sound}]
     4: endowed with the capacity to reason [syn: {reasoning(a)}, {thinking(a)}]