Cohort

Same Cohort vs. Staggered Cohorts in Constitutional Law

From the Comparative Constitutions Project: Officials elected in the same cohort all run for election at the same time. A good example of this occurs in the United States House of Representatives, where the entire house is replaced every two years. Officials elected in staggered cohorts run for election in different years. For example, in the United States Senate, 1/3 of the Senate is up for election every two years, so it takes six years to completely replace the Senate.