Definition.com
Dinner is a time when one should eat wisely but not too well, and talk well but not too wisely.
Definition.com
Dinner is when parents sit down to eat while their children sit down to continue eating.
Definition.com
Dinner is, when taken with one's family, more often than not an ordeal of nervous indigestion, preceded by hidden resentment and ennui and accompanied by psychosomatic jitters.
Definition.com
Dinner is the last business of the day, so should be allowed to progress slowly, and the guests should be allowed to conduct themselves like travelers due to reach their destination together.