What is the meaning of mission?

noun

• An organization of missionaries in a foreign land sent to carry on religious work.
  • synonyms: missionary post, missionary station, foreign mission
• An operation that is assigned by a higher headquarters.
  • usage: "the planes were on a bombing mission"
  • synonyms: military mission
• A special assignment that is given to a person or group.
  • usage: "a confidential mission to London"; "his charge was deliver a message"
  • synonyms: charge, commission
• The organized work of a religious missionary.
  • synonyms: missionary work
• A group of representatives or delegates.
  • synonyms: deputation, commission, delegation, delegacy