Are there any specific laws enacted by Parliament defining what constitutes an "office of profit under Government"?
No, there are no specific laws enacted by Parliament defining what constitutes an "office of profit under Government" in the given context. The text only mentions that a person can be disqualified for being chosen as, and for being, a member of either House of Parliament if they hold any office of profit under the Government of India or the Government of any State, other than an office declared by Parliament by law not to disqualify its holder.