Bicentennial
200th anniversary
Bicameral
Composed of two legislative chambers/branches
Bicuspid
Tooth having two points
Bigamy
Marrying one person while legally married to another
Bilateral
Having or involving two sides; binding on both parties
Bilingual
Able to use two languages
Bipartisan
Consisting of, or supported by two parties, especially two major political parties
Biped
Two footed animal
Biscuit
Twice cooked, or baked; today a quick bread baked in small pieces
Bisect
To cut in two, as a diameter bisects a circle
Bivalve
A Mollusk having two valves, or shells hinged together, as a muscle or clam