n.
1.the act of distributing things into classes or categories of the same type
2.a group of people or things arranged by class or category
3.the basic cognitive process of arranging into classes or categories
4.restriction imposed by the government on documents or weapons that are available only to certain authorized people
Idiom of the Day
the opposite sex
the opposite sex to someone (either male or female)
The math classes were divided so that nobody had to study with a member of the opposite sex.