a. [f. prec. + -ABLE.] † a. Capable of increasing. Obs. b. Capable of being increased.
1471. Ripley, Comp. Alch., XI. iii. (Ashm. 1652), 182. Ryche ys he whych any parte hath in store Of our Elixers whych be augmentable infynytly.
1775. Harris, Philos. Arrangem., Wks. 1841, 306. Every multitude is infinitely augmentable.