Webster's English Dictionary

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experimental

ex.per.i.men.tal \ik-.sper-*-'ment-*l also -.spir-\ \-*l-e-\ aj 1: of, 
   relating to, or based on experience : EMPIRICAL  2: founded on or derived 
   from experiment  3: serving the ends of or used as a means of 
   experimentation  4: relating to or having the characteristics of experiment 
   : TENTATIV E - ex.per.i.men.tal.ly av