Augmentative \Aug*ment"a*tive\, a. [Cf. F. augmentatif.]

Having the quality or power of augmenting; expressing augmentation. -- Aug*ment"a*tive*ly, adv.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Augmentative \Aug*ment"a*tive\, n. (Gram.) A word which expresses with augmented force the idea or the properties of the term from which it is derived; as, dullard, one very dull. Opposed to diminutive. --Gibbs.

Source: Webster's Revised Unabridged Dictionary (1913)