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From The Collaborative International Dictionary of English v.0.48:
Unicity \U*nic"i*ty\, n. [L. unicus single. See Unique.] The condition of being united; quality of the unique; unification. [1913 Webster] Not unity, but what the schoolmen call unicity. --De Quincey. [1913 Webster] The unicity we strive not to express, for that is impossible, but to designate by the nearest analogy. --Coleridge. [1913 Webster]