Definition of augmentative adjective from the Oxford Advanced Learner's Dictionary

 

augmentative

 adjective
adjective
BrE BrE//ˌɔːɡˈmentətɪv//
 
; NAmE NAmE//ˌɔːɡˈmentətɪv//
 
(linguistics)
 
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(of an affix or a word using an affix) increasing a quality expressed in the original word, especially by meaning ‘a large one of its kind’ Word Origin late Middle English (in the sense ‘having a tendency to increase’): from Old French augmentatif, -ive or medieval Latin augmentativus, from the verb augmentare, from Latin augere ‘to increase’.
See the Oxford Advanced American Dictionary entry: augmentative