A named set of characters sharing an attribute associated with the name of the class. The classes and the characters that they contain are dependent on the value of the LC_CTYPE category in the current locale. X/Open.
In a regular expression, a character class is an atom that matches a set of characters. Character classes may be classical Perl character classes, Unicode character classes, or user-defined character classes.
The profession the player has chosen for his or her character in a game. (D&D 1)