Try Websters, Oxfords, or just dictionary.com

https://www.merriam-webster.com/dictionary/homicide https://en.oxforddictionaries.com/definition/homicide http://www.dictionary.com/browse/homicide

"Homicide is the killing of a human being due to the act or failure to act of another. Criminal homicides include murder and manslaughter. Non-criminal homicides include killing in self-defense, a misadventure like a hunting accident or automobile wreck without a violation of law like reckless driving, or legal (government) execution. Suicide is a homicide, but is rarely prosecuted."

from definitions.uslegal.com