WordReference Random House Unabridged Dictionary of American English © 2017
ad•di•tion•al  (ə dishə nl),USA pronunciation adj. 
  1. added;
    supplementary:additional information.
ad•dition•al•ly, adv. 
  • addition + -al1 1630–40

Collins Concise English Dictionary © HarperCollins Publishers::

additional /əˈdɪʃənəl/ adj
  1. added or supplementary

adˈditionally adv

'additional' also found in these entries:

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