say it: ahg-men-TAY-shuhn
augmentation is a noun meaning "the amount by which something increases". It carries 3 recorded senses.
the amount by which something increases
the statement of a theme in notes of greater duration (usually twice the length of the original)
the act of augmenting
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for augmentation come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.