Definition of subclassing:
(n) :
A secondary class within a main class.
(n) :
(taxonomy) A rank directly below class.
(n) :
(object-oriented programming) An object class derived from another class (its superclass) from which it inherits a base set of properties and methods.
(v) :
(transitive, computing) (in object-oriented programming) To create a subclass of (some class).
(v) :
(transitive, computing) To cause (an object) to act as an instance of a subclass (by creating the desired subclass and instantiating an object of this subclass).