What are the definitions of judicial, executive and legislative?

The judiciary is the system of courts that adjudicates legal disputes/disagreements and interprets, defends, and applies the law in legal cases. 

The executive is the part of government that enforces law, and has responsibility for the governance of a state.

A legislature is an assembly with the authority to make laws for a political entity such as a country or city. They are often contrasted with the executive and judicial branches of parliamentary government in the separation of powers model. Laws enacted by legislatures are usually known as primary legislation.

a countries leader should be motivated by the common good of the country.

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