Decease (?), n. [OE. deses, deces, F. décès, fr. L. decessus departure, death, fr. decedere to depart, die; de- + cedere to withdraw. See Cease, Cede.] Departure, especially departure from this life; death.
[1913 Webster]

His decease, which he should accomplish at Jerusalem. Luke ix. 31.
[1913 Webster]

And I, the whilst you mourn for his decease,
Will with my mourning plaints your plaint increase. Spenser.

Syn. -- Death; departure; dissolution; demise; release. See Death.
[1913 Webster]