noun
A collective of people acting together, often for a specific purpose or activity. Can refer to tour groups, sports teams, delegations, etc.
旅行は団体で申し込むと安くなります。
If you apply as a group, the trip becomes cheaper.
He visited Japan as a member of the group.
noun
organization; association; body
A formally structured entity such as a non-profit, labor union, or corporate body. More institutional than sense 1.
その団体は環境保護を目的としている。
The organization aims at environmental protection.
彼は地域のボランティア団体で活動している。
He is active in a local volunteer organization.