Demonstration

Dem`on`stra´tion

The act of demonstrating; an exhibition; proof; especially, proof beyond the possibility of doubt; indubitable evidence, to the senses or reason.

Those intervening ideas which serve to show the agreement of any two others are called "proofs;" and where agreement or disagreement is by this means plainly and clearly perceived, it is called demonstration.

- Locke.

An expression, as of the feelings, by outward signs; a manifestation; a show. See also sense 7 for a more specific related meaning.

Did your letters pierce the queen to any demonstration of grief?

- Shak.

Loyal demonstrations toward the prince.

- Prescott.

(Anat.) The exhibition and explanation of a dissection or other anatomical preparation.

Mil.) a decisive exhibition of force, or a movement indicating an attack.

(Logic) The act of proving by the syllogistic process, or the proof itself.

(Math.) A course of reasoning showing that a certain result is a necessary consequence of assumed premises; - these premises being definitions, axioms, and previously established propositions.

a public gathering of people to express some sentiment or feelings by explicit means, such as picketing, parading, carrying signs or shouting, usually in favor of or opposed to some action of government or of a business.

the act of showing how a certain device, machine or product operates, or how a procedure is performed; - usually done for the purpose of inducing prospective customers to buy a product; as, a demonstration of the simple operation of a microwave oven.

Direct demonstration
(Logic & Math.) one in which the correct conclusion is the immediate sequence of reasoning from axiomatic or established premises

Indirect demonstration
called also reductio ad absurdum), in which the correct conclusion is an inference from the demonstration that any other hypothesis must be incorrect.

Noun	1.	demonstration - a show or display; the act of presenting something to sight or view; "the presentation of new data"; "he gave the customer a demonstration" Synonyms: presentation, presentment
	2.	demonstration - a show of military force or preparedness; "he confused the enemy with feints and demonstrations"
	3.	demonstration - a public display of group feelings (usually of a political nature); "there were violent demonstrations against the war" Synonyms: manifestation
	4.	demonstration - proof by a process of argument or a series of proposition proving an asserted conclusion Synonyms: monstrance
	5.	demonstration - a visual presentation showing how something works; "the lecture was accompanied by dramatic demonstrations"; "the lecturer shot off a pistol as a demonstration of the startle response" Synonyms: demo

DEMONSTRATION. Whatever is said or written to designate a thing or person. For example, a gift of so much money, with a fund particularly referred to for its payment, so that if the fund be not the testator's property at his death, the legacy will fail; this is called a demonstrative legacy. 4 Ves. 751; Lownd. Leg. 85; Swinb. 485.
2. A legacy given to James, who married my cousin, is demonstrative; these expressions present the idea of a demonstration; there are many James, but only one who married my cousin. Vide Ayl. Pand. 130; Dig. 12, 1, 6; Id. 35, 1, 34 Inst. 2, 20, 30.
3. By demonstration is also understood that proof which excludes all possibility of error; for example, mathematical deductions.

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