Let me try a concise definition (bear in mind, this is what I have been wrestling with for the last several years).

Missional communities are those groups of believers who understand the gospel as having primarily to do with the Kingdom of God which Jesus proclaimed and embodied. They understand salvation not as something one has or doesn’t have, but rather as synonymous with life lived under this rule and reign of God. These things being the case,
these communities, like Jesus, seek to collectively and personally witness to and embody this present KIngdom of God by being a blessing to the world around them.

Of course that sort of definition carries with it multitudes of implications for the structure and function of church communities. Missional communities tend to look and act differently than most churches as they rethink much of the assumed theology (understanding of God) and ecclesiology (understanding of the church) developed within modernity. I wouldn’t say that missional communities are essentially Postmodern, this would be to make some of the same modern mistakes all over again, rather, postmodernity has given us the opportunity to do some reevaluation.

If you (or anyone else really wants to get into this) I’d encourage you to check out an article by my friend Jason, “What is Missional Community?”

This website.

Or some other articles that I’ve written tagged “missional.”

Hope that’s at least moderately helpful.

Rick Royer