Dictionary source: Tolkien´s Glossary
English to English translation of Quenya
The ancient tongue, common to all Elves, in the form that it took in Valinor; brought to Middle-earth by the Noldorin exiles, but abandoned by them as a daily speech (save in Gondolin), especially after the edict of King Thingol against its use. The ancient and noble tongue of the High Elves. The tongue of the High Elves in Valinor, the first to be recorded in writing. It was never widely used in Middle-earth except among the Noldor; the related Eldarin language, Sindarin, was more commonly spoken. By the Third Age, Quenya had become, in Middle-earth, a language used only on formal or state occasions by the Elves and the descendants of the Númenóreans.