The Oxford Thesaurus An A-Z Dictionary of Synonyms - expeditionn.

1) exploration, journey, voyage, field trip, trip, tour, excursion; enterprise, undertaking, mission, quest: She went on an expedition up the Amazon to research herbal medicines. 2) speed, promptness, celerity, alacrity, dispatch or despatch, haste, rapidity, swiftness, quickness: He was ordered to complete his chores with expedition.