Webster's English Dictionary

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psychological

psy.cho.log.i.cal also psy.cho.log.ic \.si--k*-'la:j-i-k*l\ \-ik\ 
   \-i-k(*-)le-\ aj 1a: of or relating to psychology  1b: MENTAL  2: directed 
   toward the will or toward the mind specif. in its conative fun ction {~ 
   warfare} - psy.cho.log.i.cal.ly av