Understanding Missional
The Oxford English Dictionary defines missional as "relating to or connected with a religious mission; missionary." In contemporary use "missional" is an alternative for the adjective "missionary."
"Missional then, no matter what noun it is modifying, must qualify the meaning of that noun by referencing God’s mission as defined by Scripture. More specifically, missional limits any noun that it modifies to the temporary mission task of the Church to make disciples of all ta ethne for God’s glory and worship … Therefore, a local church is missional when it intentionally pursues God’s mission for His glory among all peoples by following His patterns and His ways of expanding His kingdom."
The missional living concept is rooted in the Missio dei, which means “the sending of God” in Latin. In 1934, Karl Hartenstein, a German missiologist, coined the phrase in response to Karl Barth and his emphasis on actio Dei (Latin for “the action of God”). Mission is the activity of God himself and that mission should be “understood as being derived from the very nature of God.” The Triune God is the primary acting agent in the world and within the church.
According to Lesslie Newbigin and Jesus' statements in the Gospel according to John, every Christian has been sent by Jesus with the gospel together in community to those in the surrounding culture for the sake of the King and His kingdom: “The Church is sent into the world to continue that which he came to do, in the power of the same Spirit, reconciling people to God.” Jesus said, “As the Father has sent Me, I am sending you” (John 20:21).
"No one can say: ‘Since I’m not called to be a missionary, I do not have to evangelize my friends and neighbors.’ There is no difference, in spiritual terms, between a missionary witnessing in his home town and a missionary witnessing in Katmandu, Nepal. We are all called to go—even if it is only to the next room, or the next block.”"
Read more about this topic: Missional Living