v. 1 tr. show evidence of (feelings etc.). 2 tr. describe and explain (a scientific proposition, machine, etc.) by experiment, practical use, etc. 3 tr. a logically prove the truth of. b be proof of the existence of. 4 intr. take part in or organize a public demonstration. 5 intr. act as a demonstrator.
[ L demonstrare (as DE-, monstrare show) ]