ex·pe·di·tion 
(ĕk′spĭ-dĭshən)
(ĕk′spĭ-dĭshən)n.
1.
a. A journey, especially an arduous or hazardous one, undertaken with extensive planning and a definite objective: an expedition against the enemy stronghold; a scientific expedition to the South Pole.
b. The people undertaking such a journey, considered as a group.
2. An outing undertaken with a definite objective: a shopping expedition.
3. Speed or promptness in performance. See Synonyms at haste.
[Middle English expedicioun, military campaign, from Old French expedition, from Latin expedītiō, expedītiōn-, from expedītus, past participle of expedīre, to make ready; see EXPEDITE.]