1730, "dead person," now mostly as a term in U.S. law, from Latin decedentem, present participle of decedere "to die, to depart" (see decease (n.)).
Entries linking to decedent
decease n.
"death," early 14c., from Old French deces (12c., Modern French décès) "decease, death," from Latin decessus "death" (euphemism for mors), also "a retirement, a departure," from decess-, past participle stem of decedere "die, depart, withdraw," literally "to go down," from de "away" (see de-) + cedere "to go" (from PIE root *ked- "to go, yield"). Still used with a tinge of euphemism.