n.; pl.Missionaries [ Cf. F. missionnaire. See Mission, n. ] One who is sent on a mission; especially, one sent to propagate religion. Swift. [ 1913 Webster ]
Missionary apostolic, a Roman Catholic missionary sent by commission from the pope. [ 1913 Webster ]
(n) a position for sexual intercourse; a man and woman lie facing each other with the man on top; so-called because missionaries thought it the proper position for primitive peoples