The adjective concluding means "bringing to a close," or "final." If you're writing a mystery novel, you'll want to reveal in your concluding chapter the person whodunit.

Concluding can mean either "forming" the end of something or "being" the end of something. Often these end up being the same thing, anyway, like the concluding chapter or your mystery novel that comes last and sum everything up, or the concluding remarks ("closing statements") of a trial that wrap up the arguments and come on the last day.

Definitions of concluding

adj occurring at or forming an end or termination

“his concluding words came as a surprise”
final, last, terminal
final or ending

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