What is the meaning of billet?

noun

• A short personal letter.
  • usage: "drop me a line when you get there"
  • synonyms: note, short letter, line
• Lodging for military personnel (especially in a private home. )
• A job in an organization.
  • usage: "he occupied a post in the treasury"
  • synonyms: position, post, berth, office, spot, place, situation

verb

• Provide housing for (military personnel. ).
  • synonyms: quarter, canton