Genocide is defined in Article 2 of the Convention on the Prevention and Punishment of the Crime of Genocide (1948) as
any of the following acts committed with intent to destroy, in whole or in part, a national, ethnical, racial or religious group, as such: killing members of the group; causing serious bodily or mental harm to members of the group;
deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part;
imposing measures to prevent births within the group; [and] forcibly transferring children of the group to another group.
, Office of the UN Special Advisor on the Prevention of Genocide)
USHMM Genocide Timeline