Definition of missionary position in US English:

missionary position

noun

informal
  • A position for sexual intercourse in which a couple lies face to face with the woman underneath the man.

Origin

Said to be so named because early missionaries advocated the position as ‘proper’ to primitive peoples, to whom the practice was unknown.

Pronunciation

missionary position

/ˈˌmɪʃəˌnɛri pəˈzɪʃən//ˈˌmiSHəˌnerē pəˈziSHən/