Quenya is the Elvish language created by J.R.R. Tolkien for the high-elven tradition.
Tolkien developed Quenya as one of the major languages of his invented world. Its historical inspiration includes features of Finnish, Latin, and Greek, although Quenya is not a disguised form of any one real-world language. Within Tolkien’s mythology, it was associated especially with the Noldor and other High Elves, and it functioned as a formal or literary language in many contexts.
Quenya is often confused with Sindarin, another major Elvish language. Sindarin became the everyday language of many Elves in Middle-earth, while Quenya retained a more elevated and historical status in the stories. Tolkien created related linguistic histories so that the languages could change over time like real languages.
The word “Elvish” therefore does not identify only one Tolkien language. His legendarium contains several Elvish tongues and other constructed languages, including Khuzdul and the Black Speech. Quenya is the specific high-elven answer.