An assembly of ecclesiastics, a chapter (chapter, n. 4). Also: the members of such an assembly collectively.

A chapter, n. or assembly of canons, monks etc.

The organized body of singers in cathedral or church service. The clergy of a cathedral or collegiate church engaged in performing the church…

The members of such assembly collectively as a permanent body: esp. The body of canons of a collegiate… Of a cathedral.

An enclosure about or beside a building; a court, yard, quadrangle, etc. The precinct of a cathedral. Hence sometimes = The cathedral clergy.

(Usually with capital initial.) The chapterhouse of a cathedral or collegiate church, or the chapter itself.