Well Violence comes from something that is Violent. And that is an Adjective. And Adjectives can never be Objective or have ONE factual definition. It's up to your opinion of what is and what isn't. So objectively defining an Adjective in complete detail is impossible.

The best we can do is vaguely come up with a concept of what the vast majority of Humans believe "Violent" or "Violence" means or is.

Violence: A Word used to describe a subjective level of behavior or activity that is too aggressive, disorderly, immoral, assertive, or powerful.

Violent:A Word used to describe something or someone that behaves in a subjectively high level of aggression, disorder, immorality, assertiveness, or power.

The angry dog is quite violent.

The storm violently tore through the town.

Violence is a current problem in our word.

I think it'd be something like that, I think what's important about defining violence is including that living things, inanimate things, and nature can act violently as well. As Violent can be as simple as describing a movement or behavior.

As well as including that Violent is subjective. What is violent could differ from person to person, society to society, and country to country.

No one can objectively claim anything to be violent.