All 6 Uses

congregation
in
A Spool of Blue Thread
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She wanted "Sheep May Safely Graze" and "Brother James's Air," both to be sung by only the choir, thank goodness; and then the congregation should join in on "Shall We Gather at the River?"†
p. 179.4

congregation = people who worship together in the same building
"Let us pray," he told the congregation.†
p. 186.6
Apparently, in the process of rising for the prayer, Jeannie had contrived to cast a backward glance at the congregation.†
p. 186.9 *
And that was how she began her speech, standing not behind the lectern but beside it, as if to give the congregation the full benefit of her stark black dress with the asymmetrical hemline.†
p. 187.9
She teetered up to the lectern on her strappy high heels, gazed out at the congregation with a dazzling smile, and cleared her throat.†
p. 189.1
Elise gave the congregation a triumphant look and clopped back to her seat.†
p. 189.4

Definitions:

(1) (congregation as in: the congregation voted)
people who worship together in the same building
(2) (meaning too rare to warrant focus)
Much more rarely, congregation can reference any group of people, animals, or things collected together.