I appreciate when others (pretty much all of whom are smarter and more experienced than I) reflect on missional concepts. This is from John Ward and Mike Jentes. It’s “just” definitions, but I think they are helpful:
The Word missional is simply the adjective form of the noun missionary, and like any adjective it is used to modify a noun.
Missions is to move towards or go to those different than us –culturally, socially, ethnically, economically– by crossing over those barriers and sharing the gospel with the compassion and love of Jesus.