ex·pe·di·tion / ˌekspəˈdishən/ • n. 1. a journey or voyage undertaken by a group of people with a particular purpose, esp. that of exploration, scientific research, or war: an expedition to the jungles of the Orinoco inf. a shopping expedition. ∎  the people involved in such a journey or voyage: many of the expedition have passed rigorous courses.2. formal promptness or speed in doing something: the landlord shall remedy the defects with all possible expedition.

Expedition

a body of persons, or a fleet, sent out for a specific purpose, 1693; an expeditionary force.

Example: a polar expedition.