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demonstration  n 
1 the act of demonstrating 
2 proof or evidence leading to proof 
3 an explanation, display, illustration, or experiment showing how something works 
4 a manifestation of grievances, support, or protest by public rallies, parades, etc. 
5 a manifestation of emotion 
6 a show of military force or preparedness 
7  (Maths) a logical presentation of the assumptions and equations used in solving a problem or proving a theorem 
♦  demonstrational  adj 
♦  demonstrationist  n 
demonstration model    n 
a nearly new product, such as a car or washing machine, that has been used only to demonstrate its performance by a dealer and is offered for sale at a discount