"proselytize Verb (third-person singular simple present proselytizes, present participle proselytizing, simple past and past participle proselytized)(intransitive) To encourage or induce people to join a religious movement, political party, or other cause or organization.It is illegal to proselytize in some countries To convert (someone) to one's own faith or beliefs.Related terms proselyteproselyt" . . . . .