Checkpoint (noun)

1. A point or place where something or someone is stopped and checked.
2. A point or place where a particular stage in a journey or process is reached.

Origin:

From the verb "check" + point.

Examples:

1. The police set up a checkpoint on the highway to check for drunk drivers.
2. The soldiers manned the checkpoint to ensure that only authorized personnel entered the base.
3. The runners passed through several checkpoints during the marathon.
4. The company set up a checkpoint to ensure that the product met quality standards before shipment.
5. Checkpoints are used in computer programming to ensure that a certain condition is met before proceeding.