The world will act together to hold them to account.

The members must have the ability to act together toward a common goal.

We must develop these things, and act together to protect them.

Do you not think that the only way Europe can really continue to play a role there is to act together?

The world's major economic powers showed they could act together, for one day at least.

Here, a "party" is a person or group of people who act together.

We need to act together on this state of affairs.

I think that we should act together to prevent these problems in future.

In fact, they acted together on almost all political issues.

In some cases two or more neighborhoods act together under one organization.