Humility is the state of being humble. A humble person is generally thought to be unpretentious and modest: someone who does not think that he or she is better or more important than others. Humility is not to be confused with humiliation, which is the act of making someone else feel ashamed, and is seen as something completely different. (Wikipedia online)
More definitions:
The state or quality of being humble; freedom from pride and arrogance; lowliness of mind; a modest estimate of one's own worth; a sense of one's own unworthiness through imperfection and sinfulness; self-abasement; humbleness. (Brainy Dictionary)