heresy: Meaning and Definition of

her•e•sy

Pronunciation: (her'u-sē), [key]
— pl. -sies.
  1. opinion or doctrine at variance with the orthodox or accepted doctrine, esp. of a church or religious system.
  2. the maintaining of such an opinion or doctrine.
  3. the willful and persistent rejection of any article of faith by a baptized member of the church.
  4. any belief or theory that is strongly at variance with established beliefs, customs, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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