Source : Webster's Revised Unabridged Dictionary (1913)

Experimental \Ex*per`i*men"tal\, a. [Cf.F. exp['e]rimental.]
   1. Pertaining to experiment; founded on, or derived from,
      experiment or trial; as, experimental science; given to,
      or skilled in, experiment; as, an experimental
      philosopher.

   2. Known by, or derived from, experience; as, experimental
      religion.

Source : WordNet®

experimental
     adj 1: relating to or based on experiment; "experimental physics"
     2: relying on observation or experiment; "experimental results
        that supported the hypothesis" [syn: {data-based}, {observational}]
     3: of the nature of or undergoing an experiment; "an
        experimental drug"; "a pilot project"; "a test run"; "a
        trial separation"