Definition of missionize in English:

missionize

Pronunciation /ˈmɪʃənʌɪz/

verb

(also missionise)
  • 1To conduct or promote a mission; to serve as a missionary, do missionary work.

  • 2To do missionary work among (a people) or in (a place). Also: (with pejorative connotation) to impose missionary influence upon (a people).

Origin

Early 19th century; earliest use found in Blackwood's Magazine. From mission + -ize.