The Collaborative International Dictionary
Unipersonal
Unipersonal \U"ni*per"son*al\, a. [Uni- + personal.]
Existing as one, and only one, person; as, a unipersonal God.
(Gram.) Used in only one person, especially only in the third person, as some verbs; impersonal.
Douglas Harper's Etymology Dictionary
Wiktionary
unipersonal
a. Comprising a single person