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The Collaborative International Dictionary
Unition

Unition \U*ni"tion\, n. [LL. unitio, from L. unire. See Unite,v. t.] The act of uniting, or the state of being united; junction. [Obs.]
--Wiseman.

Wiktionary
unition

n. (context obsolete English) union; the act of uniting, or the state of being united.