Source : Webster's Revised Unabridged Dictionary (1913)

Demonstrate \Dem"on*strate\ (?; 277), v. t. [L. demonstratus, p.
   p. of demonstrare to demonstrate; de- + monstrare to show.
   See {Monster}.]
   1. To point out; to show; to exhibit; to make evident.
      --Shak.

   2. To show, or make evident, by reasoning or proof; to prove
      by deduction; to establish so as to exclude the
      possibility of doubt or denial.

            We can not demonstrate these things so as to show
            that the contrary often involves a contradiction.
                                                  --Tillotson.

   3. (Anat.) To exhibit and explain (a dissection or other
      anatomical preparation).

Source : WordNet®

demonstrate
     v 1: show or demonstrate something to an interested audience;
          "She shows her dogs frequently"; "We will demo the new
          software in Washington" [syn: {show}, {demo}, {exhibit},
           {present}]
     2: establish the validity of something, as by an example,
        explanation or experiment; "The experiment demonstrated
        the instability of the compound"; "The mathematician
        showed the validity of the conjecture" [syn: {prove}, {establish},
         {show}, {shew}] [ant: {disprove}]
     3: provide evidence for; stand as proof of; show by one's
        behavior, attitude, or external attributes; "His high
        fever attested to his illness"; "The buildings in Rome
        manifest a high level of architectural sophistication";
        "This decision demonstrates his sense of fairness" [syn: {attest},
         {certify}, {manifest}, {evidence}]
     4: march in protest; take part in a demonstration; "Thousands
        demonstrated against globalization during the meeting of
        the most powerful economic nations in Seattle" [syn: {march}]