Webster's English Dictionary

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experiment

1. ex.per.i.ment \ik-'sper-*-m*nt also -'spir-\ n [ME, fr. MF, fr. L 
   experimentum, fr. experiri] 1a: TEST, TRIAL  1b: a tentative procedure or 
   policy  1c: an operation carried out under controlled conditions in order 
   to discov er an unknown effect or law, to test or establish a hypothesis, 
   or to illustrate a known law obs  2: EXPERIENCE  3: the process of testing 
   : EXPERIMENTATION 
2. ex.per.i.ment \-.ment\ \ik-sper-*-m*n-'ta--sh*n, -.men- also -.spir-\ 
   \-'sper-*-.ment-*r also -'spir-\ vi : to make experiments  - 
   ex.per.i.men.ta.tion n