It was very gravely and decorously ordered, and on a sound system; with an appeal, in everything, to the honour and good faith of the boys, and an avowed intention to rely on their possession of those qualities unless they proved themselves unworthy of it, which worked wonders.
There are no more uses of "decorum" in the book.
Show samples from other sources
All decorum was lost in the classroom.
She insists upon decorum and civility at her meetings.