Webster’s Revised Unabridged Dictionary · 1913
Augment
Aug·ment′ (a̤g·mĕnt′), v. t. [imp. & p. p. Augmented; p. pr. & vb. n. Augmenting.] [L. augmentare, fr. augmentum an increase, fr. augere to increase; perh. akin to Gr. αὔξειν, αὐξάνειν, E. wax, v., and eke, v.: cf. F. augmenter.] 1. To enlarge or increase in size, amount, or degree; to swell; to make bigger; as, to augment an army by reëforcements; rain augments a stream; impatience augments an evil.
But their spite still serves His glory to augment. Milton.
2. (Gram.) To add an augment to.
Aug·ment′, v. i. To increase; to grow larger, stronger, or more intense; as, a stream augments by rain.
Aug′ment (a̤g′mĕnt), n. [L. augmentum: cf. F. augment.] 1. Enlargement by addition; increase.
2. (Gram.) A vowel prefixed, or a lengthening of the initial vowel, to mark past time, as in Greek and Sanskrit verbs.
☞ In Greek, the syllabic augment is a prefixed ε, forming an intial syllable; the temporal augment is an increase of the quantity (time) of an initial vowel, as by changing ε to η.