What is the definition of 'karma'?

Supporting any action, with the claim, "I am doing it," is karma. Claiming doership of any action, binds karma.To support the action with the belief 'I am the doer' is called binding the karma. It is this support of the belief of 'doership' that binds karma. If you know that you are not the doer and are aware of who the true doer is, 'I am not the doer' and 'who is the doer' then the action will not have any support and the karma will be shed.