The extensional definition of function equality, discussed above, is commonly used in mathematics.

A similar extensional definition is usually employed for relations: two relations are said to be equal if they have the same extensions.

According to an extensional definition, they are abstract groups, sets, or collections of objects.

An extensional definition, also called a denotative definition, of a concept or term specifies its extension.

An extensional definition would be a list of the seven.

One important form of the extensional definition is ostensive definition.

The difference between this and an extensional definition is that extensional definitions list members, and not sets.

I can offer nothing but intensional definitions in terms of other words, or extensional definitions expressed in incomplete statistics.

An extensional definition is denoted by enclosing the list of members in curly brackets:

The abstraction is considered the extensional definition of the percept.