Noah Webster's New International Dictionary of the English Language

1. (v.) To speak of, or address, with impious irreverence; to revile impiously (anything sacred); as, to blaspheme the Holy Spirit.

2. (v.) Figuratively, of persons and things not religiously sacred, but held in high honor: To calumniate; to revile; to abuse.

3. (v. i.) To utter blasphemy.