Webster's English Dictionary

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perceive

per.ceive \p*r-'se-v\ vt [ME perceiven, fr. OF perceivre, fr. L percipere, 
   fr. per-] thoroughly + capere to take - more at PER-, HEAVE 1: to attain 
   awareness or understanding of  2: to become aware of through the senses; 
   esp : SEE, OBSE RVE - per.ceiv.er n