The physics definition of period is the duration of one complete cycle of a wave or oscillation.
Federalism- a form of government where a group of states, territories, etc., are governed by one central power. Federalists- a member of the Federalist party. Dual Federalism-the federal government and the statesâ government have separate, but equal, powers.
Dual federalism is a theory of federal constitutional law in the United States where governmental power is divided into two separate spheres. One sphere of power belongs to the federal government while the other severally belongs to each constituent state.