An Ausbausprache (also called an ausbau language) is a language which has a standard spelling, a standard grammar and a relatively wide and clear vocabulary (and is thus almost identical with a standard language). Two language forms that allow easy mutual communication can nevertheless be regarded as two different languages if they are each an Ausbausprache according to this definition. Good examples are Serbian and Croatian, Danish and Norwegian, Dutch and Afrikaans and to some some extent Hindi and Urdu. See also Abstandsprache.
See: Ausbausprache - Abstandsprache - Dachsprache