main objective
primary objective
principal objective

The main objective of this project is to help people.

"So our main objective is to get people in front of him."

The main objective of the player is to complete the game within one hour.

The main objective of the game is to break into the bank's safe.

They feel that their main objective in life is to do better than other people.

The main objective, especially when talking to men, is to keep the message simple, he says.

"But seeing him is not my main objective out here."

Our main objective is to find David and get him out of here.

We'll search for them as we go, but they can't be our main objective.

Now we need to know what our main objective is at this stage.