It is clear to me that it absolutely must be in the act. Indeed, everything in the act will stem from the definition. For us, this cornerstone must really be in the act. Since regulations are easily modifiable, if the political will changes, we could play with the definition and lose much of the meaning that the act had at the beginning.
If the legislator's objective is to forcefully express that there should be no harassment or violence in the workplace, we must start by including a clear and broad definition in the act.