dem‧on‧stra‧tion S3 W3 [countable]
an event at which a large group of people meet to protest or to support something in public
Police opened fire on a peaceful demonstration.
The proposals sparked mass demonstrations.
a demonstration against the government's educational policies
stage/hold a demonstration
Supporters staged a demonstration outside the US embassy.
an act of explaining and showing how to do something or how something works
a cookery demonstration
an action that proves that someone or something has a particular ability, quality, or feeling
The high level of calls is a clear demonstration of the need for this service.
a physical demonstration of affection