n.(law) recklessly acting without reasonable caution and putting another person at risk of injury or death (or failing to do something with the same consequences)
The lesser charge of manslaughter requires a killing through "act, procurement or culpablenegligence" which can be established with less evidence of bad motive.
Mr Raghuvanshi said on Sunday that the nine would be formally charged with culpable homicide and causing death by negligence, once the investigation into the accident had been completed.