Refers to polite, proper conduct, especially in social or formal settings. Often used in phrases like 行儀がいい (well-mannered) or 行儀が悪い (ill-mannered).
See also: お行儀
He has good manners and always speaks politely.
食事のときに行儀が悪いと、周りの人に不快な思いをさせる。
If you have bad table manners, you make those around you uncomfortable.
The mother taught her child manners.
Because she was trained from a young age, good manners have become second nature to her.
etiquette; good manners
learning good manners through apprenticeship (to an upper-class family)