What is the meaning of departure?

noun

• The act of departing.
  • synonyms: going, going away, leaving
• A variation that deviates from the standard or norm.
  • usage: "the deviation from the mean"
  • synonyms: deviation, divergence, difference
• Euphemistic expressions for death.
  • usage: "thousands mourned his passing"
  • synonyms: passing, loss, exit, expiration, going, release