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ButteryMales posted...
https://en.wikipedia.org/wiki/Genocide_Convention

Article 2 of the Convention defines genocide as:

... any of the following acts committed with intent to destroy, in whole or in part, a national, ethnic, racial or religious group, as such:

(a) Killing members of the group;
(b) Causing serious bodily or mental harm to members of the group;
(c) Deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part;
(d) Imposing measures intended to prevent births within the group;
(e) Forcibly transferring children of the group to another group.
Convention on the Prevention and Punishment of the Crime of Genocide, Article 2

(a) Happened
(b) Happened
(c) Happened
(d) could argue either or.
(e) A large part of the population is children. They want their neighboring countries to take Palestinians.

Is tendency a synonym for bias?

You've left out the most important part under international law: the intent/motiviation behind the killings. That is what separates "genocide" from other types of killing in war. If someone drops a nuclear bomb tomorrow on a country that completely wipes out a certain group, we still wouldn't know whether it was genocide without knowing the intent.