n. Increase; enlargement by addition; augmentation.n. In grammar, an addition at the beginning of certain past indicative tenses of the verb in a part of the Indo-European languages.n. In pathology, the period of a fever between its commencement and its height.To increase; enlarge in size or extent; swell: as, to augment an army by reinforcement; impatience augments an evil.In grammar, to add an augment to.In heraldry, to make an honorable addition to, as a coat of arms.To become greater in size, amount, degree, etc.; increase; grow larger.