Your insurance contract should contain a definitions section which contains all the relevant definitions for your policy. Two important definitions you should consider are that of partial disability and total disability.
Total Disability: A total disability means that a reasonable man would recognize that he should not engage in certain activity even though he literally is not physically unable to do so. It is a total disability if the insured person’s injuries are such that common care and prudence require him to desist from his business or occupation and in order to effectuate a cure or prolongation of life, common care and prudence will require that he cease work.
Partial Disability: A partial disability is the inability of the insured to perform the regular daily duties of his occupation at least one-half of the time usually required in that occupation or the inability to perform one or more of the important regular duties of his occupation.