Webster's Revised Unabridged Dictionary · 1913

Demonstrate

Demonstrate (?; 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.
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.
To exhibit and explain (a dissection or other anatomical preparation).