Definitions
1.verbTo commit blasphemy; to speak against God or religious doctrine.
2.verbTo speak of, or address, with impious irreverence; to revile impiously (anything sacred).
3.verbTo calumniate; to revile; to abuse.
4.nounAn act of irreverence or contempt toward a god or toward something considered sacred; an impious act, utterance, view, etc."That imam said that drawing the prophet Muhammad is a form of blasphemy."
5.noun(by extension) An act of irreverence towards anything considered inviolable; the act of disregarding a convention.