The Collaborative International Dictionary of English v.0.48:

Infect \In*fect"\, v. t. [imp. & p. p. Infected; p. pr. & vb.
   n. Infecting.] [L. infectus, p. p. of inficere to put or
   dip into, to stain, infect; pref. in- in + facere to make;
   cf. F. infecter. See Fact.]
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   1. To taint with morbid matter or any pestilential or noxious
      substance or effluvium by which disease is produced; as,
      to infect a lancet; to infect an apartment.
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   2. To affect with infectious disease; to communicate
      infection to; as, infected with the plague.
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            Them that were left alive being infected with this
            disease.                              --Sir T.
                                                  North.
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   3. To communicate to or affect with, as qualities or
      emotions, esp. bad qualities; to corrupt; to contaminate;
      to taint by the communication of anything noxious or
      pernicious. --Cowper.
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            Infected Ston's daughters with like heat. --Milton.
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   4. (Law) To contaminate with illegality or to expose to
      penalty.

   Syn: To poison; vitiate; pollute; defile.
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