The Letzembourgish language (Letzembourgish: Le Leitsemburge Langue) is an a posteriori language, created in the year 2015, by Grand Duke Christian Newton of Letzembourg. The Grand Duchy of Letzembourg has used it as its official language since its foundation. During the years of the language's existence, it has changed frequently and its development has been divided into two main periods:
- Germanic Period (December 2015 - January 2016): A largely Germanic language, meaning that nearly all of its grammar and vocabulary was based directly upon Dutch, German, and English.
- "Romano-Germanic Period" (January 2016 - Current): with the publishing of the new grammar rules and vocabulary, The language slowly started transitioning into a more Romantic language, as opposed to a Germanic language. Typical of this period is the usage of the letters "á, and ç." In the Romano-Germanic period, the language began to include various elements in favour of Romance languages, primarily French, but also kept its Germanic roots. Many basic root words were taken directly from French, but the Dutch and German roots still remained.