Relating to derivation.

a term used in morphology to refer to one of the two main processes of work-formation, the other being inflectional. Derivational processes result in words of a different class. In English, the major derivational process is suffixation, e.g. derive - derivation, happy - happiness, nation - national.

characterized by inflections indicating a semantic relation between a word and its base; "the morphological relation between `sing' and `singer' and `song' is derivational"