n.1 (foll. by of) a the outward showing of feeling etc. b an instance of this.
2 a public meeting, march, etc., for a political or moral purpose.
3 a the exhibiting or explaining of specimens or experiments as a method of esp. scientific teaching. b an instance of this.
4 proof provided by logic, argument, etc.
5 Mil. a show of military force.
Derivatives:
demonstrational adj.
Etymology: ME f. OF demonstration or L demonstratio (as DEMONSTRATE)