Up until the 1950s the subject of the missionary movement was referred to as "missions" in the plural form. In fact, the term "missions" was first used in its current context by the Jesuits in the sixteenth century. But the International Missionary Council discussions in the 1950s on the missio- Dei convinced most that the mission of the Triune God was prior to any of the number of missions by Christians during the two millennia of church history. Consequently, since there was only one mission, the plural form has dropped out of familir usage and the singular form, "mission," has replaced it for the most part. Nevertheless, most churches and lay-persons hang on the plural missions. For that reason, and to make our point clear here, we will refer to it in this work from time to time while alerting believers to the coming change.