1.VerbTo advertise one’s religious beliefs; to convert (someone) to one’s own faith or religious movement or encourage them to do so.
"It is illegal to proselytize [children] in some countries"
2.VerbTo coerce into religious conversion.
3.VerbTo advertise a non-religious belief, way of living, cause, point of view, (scientific) hypothesis, social or other position, political party, or other organization; to convince someone to join such a cause or organization or support such a position; to recruit someone.
"He has strong political views, and an annoying habit of proselytizing at parties."