团 is shorthand for 團, keeping 囗 border as the meaning part; 才 stands in for the old sound part 專. The first sense was round, then a group, and then an organization or society.
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Example Sentences
他们成立了一个文学团。
tāmenchénglìleyígèwénxuétuán 。
They established a literary group.
这个团体的成员非常热情。
zhègètuántǐdechéngyuánfēichángrèqíng 。
The members of this society are very enthusiastic.