The definition of humanity is the entire human race or the characteristics that belong uniquely to human beings, such as kindness, mercy and sympathy. An example of humanity is all the people in the world. An example of humanity is treating someone with kindness.Humanity is the human race or the quality that makes us human.It is the quality of being humane; kindness; benevolence. It is a kind and sympathetic attitude towards other people, especially when they are suffering in some way, its actually the state of being human, and of behaving and thinking in the same way as other people.