What is the meaning of decease?

noun

• The event of dying or departure from life.
  • usage: "her death came as a terrible shock"; "upon your decease the capital will pass to your grandchildren"
  • synonyms: death, expiry

verb

• Pass from physical life and lose all bodily attributes and functions necessary to sustain life.
  • usage: "She died from cancer"; "The children perished in the fire"; "The patient went peacefully"; "The old guy kicked the bucket at the age of 102"
  • synonyms: die, perish, go, exit, pass away, expire, pass, kick the bucket, cash in one's chips, buy the farm, conk, give-up the ghost, drop dead, pop off, choke, croak, snuff it