demonstration

Etymology

From Middle English demonstracioun, from Old French demonstration, from Latin demonstrationem, from demonstrare (“show or explain”), from de- (“of or concerning”) + monstrare (“show”). Morphologically demonstrate + -ion

noun

1. 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. 1577, Socrates Scholasticus [i.e., Socrates of Constantinople], “Constantinus the Emperour Summoneth the Nicene Councell, it was Held at Nicæa a Citie of Bythnia for the Debatinge of the Controuersie about the Feast of Easter, and the Rootinge out of the Heresie of Arius”, in Eusebius Pamphilus, Socrates Scholasticus, Evagrius Scholasticus, Dorotheus, translated by Meredith Hanmer, The Avncient Ecclesiasticall Histories of the First Six Hundred Yeares after Christ, Wrytten in the Greeke Tongue by Three Learned Historiographers, Eusebius, Socrates, and Euagrius. …, book I (The First Booke of the Ecclesiasticall Historye of Socrates Scholasticvs), imprinted at London: By Thomas Vautroullier dwelling in the Blackefriers by Ludgate, →OCLC, page 225
   1. (prison slang) A prisoner's act of beating up another prisoner.
2. An event at which something will be demonstrated.
   I have to give a demonstration to the class tomorrow, and I'm ill-prepared.
3. Expression of one's feelings by outward signs.
4. A public display of group opinion, such as a protest march.
5. A show of military force.
6. (mathematics, philosophy) 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. a. 1697, John Aubrey, Brief Lives, s.v. Thomas Hobbes
   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. 2021-09-21, Aristotle, The Complete Works of Aristotle. Illustrated: Logic, Universal Physics, Human Physics, Animal Physics, Metaphysics, Ethics and Politics and other, Strelbytskyy Multimedia Publishing