Webster's English Dictionary

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conscience

con.science or in conscience \'ka:n-ch*n(t)s\ n [ME, fr. OF, fr. L 
   conscientia, fr. conscient-, consciens, pr]p. of conscire to be conscious, 
   be conscious of guilt, fr. com- + scire to know - more at SCIENCE 1a: the 
   sense or consciousness of the moral goodness or blameworthiness of  one's 
   own conduct, intentions, or character together with a feeling of obligation 
   to do right or be good 1b: a faculty, power, or principle enjoining good 
   acts  1c: the part of the superego in psychoanalysis that transmits 
   commands and  admonitions to the ego obs  2: CONSCIOUSNESS  3: conformity 
   to the dictates of conscience : CONSCIENTIOUSNESS  : in all fairness  - in 
   all conscience