Glossary: binomial electoral system
DEFINITION:
In this unique majority system, which governs Chile’s congressional elections, political parties or groupings form pacts and permit slates (two candidates per slate), from which two senators and two deputies are elected from each district. By requiring each party to obtain two-thirds of the vote in each district for the successful election of its two candiddates to the legislature, this system gives the opposition disproporationate representation in Congress