AUGMENT (3)

augment (3). Augment, n. an increase, state of increase, prefix

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Aug″ment (�), n. [[L. augmentum: cf. F. augment.]] 1. 1. Enlargement by addition; increase.
2. 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 �, forming an intial syllable; the temporal augment is an increase of the quantity (time) of an initial vowel, as by changing � to �.