In some Indo-European languages, a prefix e- (a- in Sanskrit) indicating a past tense of a verb.
"The linguist noted that the augment serves as a crucial marker for identifying past tense verbs in ancient Indo-European tongues like Greek and Sanskrit."
enlarge or increase
"The recent speech of the president augmented tensions in the Near East"
To increase; to make larger or supplement.
"The company plans to augment its marketing budget by an additional five percent next quarter."
The word "augment" comes from the Latin verb augere, meaning "to increase." It entered English via Middle French and Old French as a term for adding to something or making it larger.