원정이나 탐험, 또는 특히 외국으로 파견되는 군대와 관련된.
Relating to, forming, or sent on an expedition, especially a military journey to a foreign country.
예문:
"The nation deployed an expeditionary force to assist in the peacekeeping mission."
"The scientists organized an expeditionary team to study the remote glaciers in Antarctica."
"The historical museum features artifacts from various expeditionary campaigns of the 19th century."