Webster's English Dictionary

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empirical

em.pir.i.cal or em.pir.ic \-i-k*l\ \-ik\ \-i-k(*-)le-\ aj 1: relying on 
   experience or observation alone often without due regard for  system and 
   theory 2: originating in or based on observation or experience  3: capable 
   of being verified or disproved by observation or experiment { ~ laws} - 
   em.pir.i.cal.ly av