Source : Webster's Revised Unabridged Dictionary (1913)

Cognizant \Cog"ni*zant\ (? or ?), a. [See {Cognizance}, and cf.
   {Connusant}.]
   Having cognizance or knowledge. (of).

Source : WordNet®

cognizant
     adj : (usually followed by `of') having knowledge or
           understanding; "our youth are cognizant of the law"; "I
           am well aware of his limitations" [syn: {cognisant}, {well
           aware(p)}, {aware(p)}] [ant: {incognizant}]