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 ]
n. (Theol.) One who believes that the Deity is unipersonal. [ 1913 Webster ]