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It is quite well defined.
[1] https://www.theglobeandmail.com/standards-editor/article-und...
https://www.ohchr.org/en/press-releases/2023/08/venezuela-un...
But we know you understand this.
If not, then the definition might still hold meaning and Russia's appellation might be ridiculous.
In all seriousness though why even engage this line of argument at this point? very few brain cells are required to understand the solar system sized gap between the standards used for a western country to label something terrorist and for Russia (or Iran, or China, etc...). The argument is either being made in bad faith or in fanaticism driven ignorance, neither of which words on the internet will change. The correct and only action for this level of argument is ridicule.
There is a meaningful difference between collateral death and terrorism.
> According to paramedics and rescue teams involved in the recovery of the bodies, some bodies were found with hands tied, indicating possible execution. Other victims were found with bullet marks on their heads, raising suspicions of summary executions. There are also reports of torture marks on the bodies.[34][35]
>According to Palestinian government-run news agency Wafa, some bodies were found suspicious of organ theft with their stomachs open and stitched up, contrary to the usual wound closure techniques in the Gaza Strip. The mutilated body of a little girl wearing a surgical gown was also found, prompting suspicions that she had been buried alive.[34]
This does not sound like "collateral damage".