Webster's Revised Unabridged Dictionary · 1913

Decease

Decease , noun

[Old English deses, deces, French décès, from Latin decessus departure, death, from decedere to depart, die; de- + cedere to withdraw. See Cease, Cede.]

Departure, especially departure from this life; death.
His decease, which he should accomplish at Jerusalem. — Luke ix. 31
And I, the whilst you mourn for his decease, Will with my mourning plaints your plaint increase. — Spenser

Decease , intransitive verb

To depart from this life; to die; to pass away.
She's dead, deceased, she's dead. — Shakespeare
When our summers have deceased. — Tennyson
Inasmuch as he carries the malignity and the lie with him, he so far deceases from nature. — Emerson