IPA: /dɪˈsiːdənt/
KK: /dɪˈsiːdənt/
A person who has died, especially in a legal context.
The estate of the decedent will be distributed according to the will.
Decedent is formed from "de-" (meaning down or away) and "cedere" (meaning to go or yield). The term refers to a person who has gone away from life, specifically someone who has died.
Think of someone who has 'gone away' ('cedere') from life ('de-'), which helps you remember that a decedent is a person who has passed away.