expedition
/ɛkspəˈdɪʃən/noun
A journey, often a long one, that a person or group undertakes for a definite purpose.
Example sentences
- “The scientists set off on an expedition to study glaciers in Alaska.”
- “Their expedition to the South Pole took almost three months.”
Implies organization and purpose: scientific, military, or climbing expeditions. A casual outing is a 'trip', not an expedition, unless you are joking.