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.
Federalism in the United States. Federalism in the United States is the constitutional relationship between U.S. state governments and the Federal government of the United States. Since the founding of the country, and particularly with the end of the American Civil War, power shifted away from the states and towards the national government. The progression of federalism includes dual, state-centered, and new federalism.