1) An artificial language 2) Artificial language 3) Constructed language 
The teaching of sign languages to the deaf was discouraged between 1880 and 1991 in France, contributing to Solresol`s descent into obscurity. After a few years of popularity, Solresol nearly vanished in the face of more successful languages, such as Volapük and Esperanto. There is still a small community of Solresol enthusiasts scattered across....
[n] - an artificial language
noun an artificial language