demonstration

noun

1. (countable, uncountable)The act of demonstrating; showing or explaining something.

   “[VV]e are able with playne demonſtration to proue, and vvith reaſon to perſvvade that in tymes paſt our fayth vvas alike, that then vve preached thinges correſpondent vnto the forme of faith already published of vs, ſo that none in this behalfe can repyne or gaynesay vs.”

2. (countable, slang, uncountable)The act of demonstrating; showing or explaining something.
3. (countable, uncountable)An event at which something will be demonstrated.

   “I have to give a demonstration to the class tomorrow, and I'm ill-prepared.”

4. (countable, uncountable)Expression of one's feelings by outward signs.
5. (countable, uncountable)A public display of group opinion, such as a protest march.

   “It's produced tremendous activism and backlash: there's been all sorts of demonstrations and mobilizations in civil society, there's been examples from the people from the Administration being heckled in a restaurant or not served in a restaurant, there's been a growing crescendo of conversation about what that means.”

   “Even when there had been hecklers, Victor and other members would focus on setting up their demonstration — signs reading “Let them go now,” and posters bearing the faces of 58 hostages still being held in Gaza.”

6. (countable, uncountable)A show of military force.
7. (countable, uncountable)A proof.

   “He read the proposition. […] So he reads the demonstration of it, which referred him back to such a proposition,; which proposition he read.”

   “If, then, proof from the basic truth is more accurate than proof not so derived, demonstration which depends more closely on it is more accurate than demonstration which is less closely dependent.”