What does the word service mean?

Usage examples for service

  1. At your service, sir, if you are sent to help in this business? – Foe-Farrell by Arthur Thomas Quiller-Couch
  2. Are you too ill for service? – Love Eternal by H. Rider Haggard
  3. No. He's away on some secret service. – Harley Greenoak's Charge by Bertram Mitford