Definition of scalping?

I often read about brokers are trying to prevent traders from scalping, and that you can get "flagged" for doing so.

In your opinion, what is the definition of scalping to the extent that your broker will start taking actions?

Is it when a trade only has a 5 pip profit target?
Is it when a trade lasts under 1 minute?

You can ask 5 brokers what their definition of scalping is and your going to get 5 different answers.

, Good point!