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From The Collaborative International Dictionary of English v.0.48:
Unipersonal \U"ni*per"son*al\, a. [Uni- + personal.] [1913 Webster] 1. Existing as one, and only one, person; as, a unipersonal God. [1913 Webster] 2. (Gram.) Used in only one person, especially only in the third person, as some verbs; impersonal. [1913 Webster]