Definition of includable in US English:

includable

(also includeable)

adjective

  • That may be included or incorporated; (now) especially that is to be included in a calculation of income, assets, etc.; = includible. Chiefly in predicative use with in, within, etc.

Origin

Late 18th century; earliest use found in Jeremy Bentham (1748–1832), philosopher, jurist, and reformer. From include + -able.