Decease n. : Departure, especially departure from this life; death.

Decease v. i. : To depart from this life; to die; to pass away.

Example:
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Taxonomy
decease, Merriam-Webster Online Dictionary, Dictionary, webster, departure, Word Games, Webster Online Dictionary with audio pronunciations, Middle English, death, glossary, language, ESL, Search, cease, Etymology, deces, Anglo-French, Latin.

Defination from the web:
decease from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "decease" and related topics at Britannica.com. See a map of "decease" in the Visual Thesaurus. Pronunciation Symbols. Share this entry: ...