Exact historical dictionary sense
Union in Webster's 1913 dictionary
The 1913 record labels union as noun. Its source-bounded etymology and selected historical definition appear below.
[F., from L. unio oneness, union, a single large pearl, a kind of onion, fr. unus one. See One, and cf. Onion, Unit.]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "union" is labeled noun. Its etymology is recorded as: "[F., from L. unio oneness, union, a single large pearl, a kind of onion, fr. unus one. See One, and cf. Onion, Unit.]" The selected historical definition says: "The act of uniting or joining two or more things into one, or the state of being united or joined; junction; coalition; combination."