demonstration

noun

1. a show or display; the act of presenting something to sight or view"the presentation of new data"
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"