Pros"e*ly*tism (?), n. [Cf. F. pros'elytisme.]
1.
The act or practice of proselyting; the making of converts to a religion or a religious sect, or to any opinion, system, or party.
They were possessed of a spirit of proselytism in the most fanatical degree.
Burke.
2.
Conversion to a religion, system, or party.
© Webster 1913.