Demissio
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
L. Lat. A demise or letting. Chiefly used in the phrase ex demissione (on the demise), which formed part of the title of the cause in the old actions of ejectment, where it signified that the nominal plaintiff (a fictitious person) held the estate 'ion the demise" of, that is, by a lease from, the real plaintiff.