unipersonalist noun2 •One who believes in a unipersonal deity, i.e. that God is one being, while being the Father, Son and Holy Spirit.This dictates the reasonableness of the rupture of a unipersonalist absolute that is pseudomonotheistic since, in this case, the possibility of any other being would have been made impossible. — 2004 •(Philippines) An autocrat; One who does not share political power with other people, or one who supports such a ruler. formsunipersonalists