Synonyms for Expedition (same or very similar meaning)
WordNet sense 1 (the property of being prompt and efficient):
despatch, dispatch, expeditiousnessWordNet sense 2 (a military campaign designed to achieve a specific objective in a foreign country):
hostile expedition, military expeditionWordNet sense 3 (a journey taken for pleasure):
excursion, jaunt, junket, outing, sashay, pleasure tripFrom the ODE community, based on WordNetadd/edit