Formative

1. A word formed in accordance with some rule or usage, as from a root.
2. Serving to form; derivative; not radical; as, a termination merely formative.
3. Capable of growth and development; germinal; as, living or formative matter.
4. That which serves merely to give form, and is no part of the radical, as the prefix or the termination of a word.
5. Giving form; having the power of giving form; plastic; as, the formative arts.