the study of the missionary function of the Christian Church
missiology in American English
(ˌmɪsiˈɑlədʒi)
noun
the theological study of the mission of the church, esp. the character and purpose of missionary work
Word origin
[1920–25; missi(on) + -o- + -logy]This word is first recorded in the period 1920–25. Other words that entered Englishat around the same time include: Unknown Soldier, follow-up, superpower, tie-in, zipper-o- is the typical ending of the first element of compounds of Greek origin (as -i- is, in compounds of Latin origin), used regularly in forming new compounds with elementsof Greek origin and often used in English as a connective irrespective of etymology(Franco-Italian; geography; seriocomic; speedometer); -logy is a combining form used in the names of sciences or bodies of knowledge. Other wordsthat use the affix -logy include: genealogy, geology, methodology, topology, tropology
Examples of 'missiology' in a sentence
missiology
This is exactly what missiology endeavours to study.
Times, Sunday Times (2008)
Perhaps they may offer us fresh insights helping us to reimagine missiology from a global perspective.