(obsolescent) Departure, especially departure from this life.
Origin of Decease
Middle English decesen from deces death from Old French from Latin dēcessus departure, death from past participle of dēcēdere to depart, die dē- de- cēdere to go ked- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
From Old French deces (French décès).
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