Noun
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"