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demonstration (n.)

late 14c., demonstracioun, "proof that something is true," by reasoning or logical deduction or practical experiment, from Old French demonstration (14c.) and directly from Latin demonstrationem (nominative demonstratio), noun of action from past-participle stem of demonstrare "to point out, indicate, demonstrate," figuratively, "to prove, establish," from de- "entirely" (see de-) + monstrare "to point out, reveal show," which is related to monstrum "divine omen, wonder" (source of monster). Both are derivatives of monere "to remind, bring to (one's) recollection, tell (of); admonish, advise, warn, instruct, teach," from PIE *moneie- "to make think of, remind," a suffixed (causative) form of the root *men- (1) "to think."

Sense of "exhibition and explanation of practical operations" is by 1807. Meaning "public show of feeling by a number of persons in support of some political or social cause," at first usually involving a mass meeting and a procession, is from 1839. Related: Demonstrational.

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Definitions of demonstration from WordNet

demonstration (n.)
a show or display; the act of presenting something to sight or view;
he gave the customer a demonstration
demonstration (n.)
a show of military force or preparedness;
he confused the enemy with feints and demonstrations
demonstration (n.)
a public display of group feelings (usually of a political nature);
there were violent demonstrations against the war
Synonyms: manifestation
demonstration (n.)
proof by a process of argument or a series of proposition proving an asserted conclusion;
Synonyms: monstrance
demonstration (n.)
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
From wordnet.princeton.edu