mountaineering party; climbing expedition
Refers to a group of people organized for a mountain-climbing expedition, often with a leader and support members.
The mountaineering party left base camp early in the morning.
He was a member of the Everest climbing expedition.
隊 is a suffix meaning 'party', 'group', or 'corps', used in many compound nouns like 救助隊 (rescue party) or 探検隊 (expedition party).
Compound of 登山 (とざん, 'mountain climbing') and 隊 (たい, 'party, group').