ETYM Latin demonstratus, p. p. of demonstrare to demonstrate; de- + monstrare to show. Related to Monster.
1. To give a demonstration of; SYN. show.
2. To march in protest; take part in a demonstration; SYN. march.

1. To be shown or be found to be; SYN. demonstrate, establish, show, shew.
3. To obtain probate of, as of a will.
4. To prove formally; demonstrate by a mathematical, formal proof.
5. To take a trial impression of.

To establish as valid or genuine; SYN. back, back up.