Demonstration definition

(1) A show or display; the act of presenting something to sight or view

"The presentation of new data"

"He gave the customer a demonstration"

(2) A show of military force or preparedness

"He confused the enemy with feints and demonstrations"

(3) A public display of group feelings (usually of a political nature)

"There were violent demonstrations against the war"

(4) Proof by a process of argument or a series of proposition proving an asserted conclusion

(5) 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"