Addi'tional. adj. [from addition.] That which is added.
Our kalendar being once reformed and set right, it may be kept so, without any considerable variation, for many ages, by omitting one leap-year; i. e. the additional day, at the end of every 134 years. Holder on Time.
The greatest wits, that ever were produced in one age, lived together in so good an understanding, and celebrated one another with so much generosity, that each of them receives an additional lustre from his cotemporaries. Addison. Spectator.
They include in them that very kind of evidence, which is supposed to be so powerful; and do, withal, afford us several other additional proofs, of great force and clearness. Atter. Serm.