WordReference Random House Unabridged Dictionary of American English © 2026
ad•di•tion•al
(ə dish′ə nl),USA pronunciation adj.
ad•di′tion•al•ly, adv.
- added;
more;
supplementary:additional information.
- addition + -al1 1630–40
'additionally' also found in these entries (note: many are not synonyms or translations):