n. The act of increasing or making larger by addition, expansion, or dilatation; the act of adding to or enlarging; the state or condition of being made larger.n. That by which anything is augmented; an addition: as, the augmentation amounted to $500 a year.n. Specifically In music, where much repetition and imitation of themes is required, the modification of a theme or subject by systematically increasing the original time-value of all its notes. In heraldry, an additional charge to a coatarmor, granted as a mark of honor to an armiger.n. In pathology, same as augmentn. A hypothesis relating to the development of number systems, according to which the primary number-concept was based on the idea of the self and of the four directions front, back, right, left, and sometimes, in addition to these, above and below.n. In astronomy, the excess of the moon's apparent diameter, seen from a given point, over its diameter as it would be if seen from the center of the earth. The excess is due to the fact that the moon, except when on the horizon, is nearer to the observer than to the earth's center.n. In botany, same as multiplication, 3.n. In law, a share of the great tithes temporarily granted to the vicars by the appropriators, and made perpetual by a statute of Charles II.: also used in a similar sense in the Canadian law.