(n): the activity of putting things together in groups
(n): a group of people or things arranged by class or category
(n): an orderly grouping (of things or persons) considered as a unit; the result of arranging
(n): the basic cognitive process of arranging into classes or categories
(n): cognitive processes involved in obtaining and storing knowledge
(n): restriction imposed by the government on documents or weapons that are available only to certain authorized people
(n): the act of keeping something within specified bounds (by force if necessary)
