noun

1. the quality or condition of being negligent; specif.,
   1. habitual failure to do the required thing
   2. carelessness in manner or appearance; indifference
2. an instance of such failure, carelessness, or indifference
3. Law failure to use a reasonable amount of care when such failure results in injury or damage to another

Etymology: ME neglygence < OFr négligence < L negligentia