Exact historical dictionary sense
Addition in Webster's 1913 dictionary
The 1913 record labels addition as noun. Its source-bounded etymology and selected historical definition appear below.
[F. addition, L. additio, fr. addere to add.]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "addition" is labeled noun. Its etymology is recorded as: "[F. addition, L. additio, fr. addere to add.]" The selected historical definition says: "The act of adding two or more things together; -- opposed to subtraction or diminution."