augmentative
1. [ adjective ] increasing or having the power to increase especially in size or amount or degree
Synonyms: building augmenting
Examples:

"`up' is an augmentative word in `hurry up'"

Related terms: increasing
2. [ adjective ] intensifying by augmentation and enhancement
Synonyms: enhancive
Related terms: intensifying
Similar spelling:   augmentation
  augmentin
  augmented
  augmenting