This is the 1461st most frequent Japanese word.
結成
Formation or establishment.
In this sentence, '結成' (kessei) is used to describe the action of establishing or forming a band.
私たちは新しいバンドを結成しました。
We formed a new band.
Here, '結成' indicates the formation or establishment of an organization, used in passive form to denote it was formed.
その団体は1985年に結成されました。
That organization was formed in 1985.
In this instance, '結成' refers to the planned establishment of a project team, showing future scheduling.