GNU Collaborative International Dictionary of English

Found one definition

1.       
   Demonstrate , v. t. [L. demonstratus, p. p. of demonstrare to demonstrate; de- + monstrare to show. See Monster.]
   To point out; to show; to exhibit; to make evident.
   Shak.
   
   1913 Webster
   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.
   1913 Webster
   We can not demonstrate these things so as to show that the contrary often involves a contradiction.
   Tillotson.
   
   1913 Webster
   (Anat.) To exhibit and explain (a dissection or other anatomical preparation).
   1913 Webster