The meaning of destruction is to destroy or do so much damage to something that it no longer exists. There are several ways you can destroy something:
Well, since you posted this on this category, I don't think you're looking for this definition from a dictionary? I'm not sure but, I think this is no mistake and you're referring to destruction that's related to the mental health and psychology of a person, and that's what I'm going to talk about in my answer. My apologies if this is not what you're looking for.
So, they have already provided you with the definition of the word. But destruction in terms of mental health and psychology can manifest itself in self-destructive behaviors. Self-destructive behavior causes harm to the person engaging in that behavior. There are so many levels of self-destructive behaviors with suicide being the most extreme harm someone would cause themselves. Some forms of self-destruction are:
These behaviors provide temporary relief and even pleasure in some cases. These behaviors have been linked to childhood traumas and physical abuse.