disseize /dɪˈsiːz/ verb1 •(no longer used) To deprive of seisin or possession; to dispossess or oust wrongfully (one in freehold possession of land).which savage beasts strive as eagerly to keep and hold those golden mines, as the Arimaspians to disseize them thereof — 1601 formsdisseized · disseizing · disseizes