Webster's English Dictionary

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demonstration

dem.on.stra.tion \.dem-*n-'stra--sh*n\ \-shn*l, -sh*n-*l\ \-sh(*-)n*st\ n 
   1: an outward expression or display  2: an act, process, or means of 
   demonstrating to the intelligence : as  2a1: conclusive evidence : PROOF  
   2a2: a proof in which the conclusion is the immediate sequence of reasoning 
    from premises 2b: a showing to a prospective buyer of the merits of a 
   product  3: a show of armed force  4: a public display of group feelings 
   toward a person or cause  - dem.on.stra.tion.al aj