demonstration in WordNet English dictionary

1. 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"
   demonstration  demo 
   
2. a show or display; the act of presenting something to sight or view
   "the presentation of new data"; "he gave the customer a demonstration"
   presentation  presentment  demonstration 
   
3. a public display of group feelings (usually of a political nature)
   "there were violent demonstrations against the war"
   demonstration  manifestation 
   
4. a show of military force or preparedness
   "he confused the enemy with feints and demonstrations"
   demonstration 
   
5. proof by a process of argument or a series of proposition proving an asserted conclusion
   demonstration  monstrance