Decease \De*cease"\, v. i. [imp. & p. p. {Deceased}; p. pr. & vb. n. {Deceasing}.] To depart from this life; to die; to pass away. She's dead, deceased, she's dead. --Shak. When our summers have deceased. --Tennyson. Inasmuch as he carries the malignity and the lie with him, he so far deceases from nature. --Emerson.