Source : Webster's Revised Unabridged Dictionary (1913)

Experimentation \Ex*per`i*men*ta"tion\, n.
   The act of experimenting; practice by experiment. --J. S.
   Mill.

Source : WordNet®

experimentation
     n 1: the testing of an idea; "it was an experiment in living";
          "not all experimentation is done in laboratories" [syn:
          {experiment}]
     2: the act of conducting a controlled test or investigation
        [syn: {experiment}]