Webster's English Dictionary

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infection

in.fec.tion \in-'fek-sh*n\ n 1: the act or result of affecting injuriously  
   2: an act or process of infecting; also : the establishment of a pa thogen 
   in its host after invasion 3: the state produced by the establishment of an 
   infective agent in or on a  suitable host; also : a contagious or 
   infectious disease 4: an infective agent or material contaminated with an 
   infective agent  5: the communication of emotions or qualities through 
   example or contact