expedition in WordNet English dictionary

1. the property of being prompt and efficient
   "it was done with dispatch"
   dispatch  despatch  expedition  expeditiousness 
   
2. a journey taken for pleasure
   "many summer excursions to the shore"; "it was merely a pleasure trip"; "after cautious sashays into the field"
   excursion  jaunt  outing  junket  pleasure trip  expedition  sashay 
   
3. a journey organized for a particular purpose
   expedition 
   
4. a military campaign designed to achieve a specific objective in a foreign country
   expedition  military expedition  hostile expedition 
   
5. an organized group of people undertaking a journey for a particular purpose
   "an expedition was sent to explore Mars"
   expedition