Billancourt is a commune of the Somme département, in eastern France. The commune (in French: commune, word appeared in the 12th century, from Medieval Latin communia, meaning a gathering of people sharing a common life, from Latin communis, things held in common) is the lowest level of administrative division in the French Republic. ... Somme is a French département, named after the Somme River, located in the north of France. ... The départements (or departments) are administrative units of France and many former French colonies, roughly analogous to British counties. ...