means The practice of making sure people are genuinely welcomed, valued, and able to participate fully — not just present, but part of things.

from From Latin includere, 'to shut in, enclose,' built from in- ('in') plus claudere ('to close') — the same claudere that gives us 'close,' 'conclude,' and 'seclude.' Originally it meant literally walling something in; the modern sense of opening doors rather than closing them is a relatively recent inversion, the warm social meaning blooming mainly in the late 20th century.