demonstrate

verb

1.
2.
establish the validity of something, as by an example, explanation or experiment
SW bevis truthen establish prove shew show
Derived from:
demonstrative
3.
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
attest certify evidence manifest
Derived from:
demonstrative
4.
march in protest; take part in a demonstration
march
Agent:
demonstrator
Event:
demonstration
Derived from:
demonstration demonstrator