additional

Etymology

addition + -al

adj

1. Supplemental or added to something.
   Why this already very fast train should be speeded up still further, when none of the other more easily timed S.R. West of England trains has a single minute pared from its schedule, is unexplained - unless this is a playful dig at the Western Region, most of whose expresses, by reason of additional stops, will be decelerated from the same date. 1961 October, “The winter timetables of British Railways: Southern Region”, in Trains Illustrated, page 593
   Nevertheless, it is clear that the global energy demand for air-conditioning will grow substantially as nations become more affluent,[…]. This trend will put additional strain not only on global energy resources but also on the environmental prospects of a warming planet. 2013 September-October, Michael Sivak, “Will AC Put a Chill on the Global Energy Supply?”, in American Scientist

noun

1. Something added.
   1614, Francis Bacon, “A Letter to the King touching Peacham’s Cause. January 27. 1614” in Resuscitatio, or, Bringing into publick light severall pieces of the works […] of Francis Bacon, London: William Lee, 1657, p. 49, For having received, from my Lord, an Additional, of great Importance; which was, that Owen, of his own Accord, after Examination, should compare the Case of your Majesty, (if you were Excommunicate,) to the Case, of a Prisoner, Condemned at the Barr; which Additional was subscribed by one Witness; but yet I perceived it was spoken aloud, and in the Hearing of others; I presently sent down a Copy thereof […]
   […] having been well vers’d in British Histories, and a singular lover of Antiquities, [he] made many additionals to the Historie of Cambria published by Dav. Powell […] 1692, Anthony à Wood, Athenæ Oxonienses, London: Thomas Bennet, page 248