\In`fi*del"i*ty\, n.; pl. {Infidelities}. [L.
infidelitas: cf. F. infid['e]lit['e].]
1. Want of faith or belief in some religious system;
   especially, a want of faith in, or disbelief of, the
   inspiration of the Scriptures, of the divine origin of
   Christianity.
         There is, indeed, no doubt but that vanity is one of
         the principal causes of infidelity.   --V. Knox.
2. Unfaithfulness to the marriage vow or contract; violation
   of the marriage covenant by adultery.
3. Breach of trust; unfaithfulness to a charge, or to moral
   obligation; treachery; deceit; as, the infidelity of a
   servant. ``The infidelity of friends.'' --Sir W. Temple.