"Progressive acceleration" is not a commonly used term in a specific field like physics or engineering. It could have different interpretations depending on the context. Here are a few possibilities:

1. In the context of training:

* Progressive overload: This is a principle used in fitness and strength training where you gradually increase the intensity, duration, or frequency of your workouts over time. This could be considered a form of progressive acceleration as you are accelerating your training progress.

2. In the context of business:

* Accelerated growth: This refers to a period of rapid growth and development in a business. It could be considered "progressive" if the acceleration is consistent and sustainable over time.

3. In the context of a specific event or process:

* Increasing rate of change: If something is experiencing a progressive acceleration, it means that the rate at which it is changing is increasing. For example, a car accelerating progressively might be increasing its speed at a faster and faster rate.

4. In the context of physics:

* Non-uniform acceleration: This refers to acceleration that is not constant. While technically not "progressive," this could be interpreted as a type of acceleration that is increasing or decreasing over time.

To understand the specific meaning of "progressive acceleration," you need to consider the context in which it is used. If you provide more information about the situation, I can help you understand the meaning better.