demonstration

1. The act of demonstrating; showing or explaining something. (countable, uncountable)
2. A prisoner's act of beating up another prisoner. (countable, slang, uncountable)
3. An event at which something will be demonstrated. (countable, uncountable) · I have to give a demonstration to the class tomorrow, and I'm ill-prepared.
4. Expression of one's feelings by outward signs. (countable, uncountable)
5. A public display of group opinion, such as a protest march. (countable, uncountable)
6. A show of military force. (countable, uncountable)
7. A proof. (countable, uncountable)

Plural demonstrations