additional

• add'l (abbreviation)

From addition +‎ -al.

• IPA^(key): /əˈdɪʃənəl/

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additional (not comparable)

1. Supplemental or added to something.
   • 1961 October, “The winter timetables of British Railways: Southern Region”, in Trains Illustrated, page 593:

     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.

   • 2013 September-October, Michael Sivak, “Will AC Put a Chill on the Global Energy Supply?”, in American Scientist:

     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.

• epi-

additional (plural additionals)

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,^[1]

     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 […]

   • 1692, Anthony à Wood, Athenæ Oxonienses‎^[2], London: Thomas Bennet, page 248:

     […] 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 […]