"Discipleship". A term right from the clavis of "Christianese". Rarely defined succinctly.

https://en.wikipedia.org/wiki/Christianese

Here is the best definition I have come across, from Greg Herrick's "Understanding The Meaning of the Term “Disciple”...

Let’s summarize what we’ve been talking about thus far. For our purposes, then, a “disciple of Christ” is someone who has been called first to know Christ, then to follow him, and then to make disciples of all nations. That is, in our knowing Christ we are becoming like him—thinking, feeling, and living as he commands. In this spiritual ambience of personal relationship with him, that is, in light of our experience of the kingdom, he summons us to be his disciples. We are to follow him, through thick and through thin, knowing that he is there and that he will reward us in his time; after all, he is the Master. But discipleship not only involves being with him, being like him, and following him, it also means that we make it our goal to disciple others—indeed, every nation under the sun. The Great Commission is not just another good idea—though it is that—it is the church’s marching order. As far as I know, he never communicated another plan.