A secondary class within a main class.
A rank directly below class.
An object class derived from another class (its superclass) from which it inherits a base set of properties and methods.
To cause (an object) to act as an instance of a subclass (by creating the desired subclass and instantiating an object of this subclass).
(in object-oriented programming) To create a subclass of (some class).
A group of one or more populations of an organism or organisms seen by taxonomists to form a unit.