1. a country in western Europe, between Belgium and Germany and north of France; population 567,000 (estimated 2015); capital, Luxembourg; official languages, Luxemburgish, French, and German.
▪ the capital of the Grand Duchy of Luxembourg; population 88,600 (est. 2009). It is the seat of the European Court of Justice.
▪ a province of southeastern Belgium, until 1839 a province of Luxembourg; capital, Arlon.