More about conlang
Conlang, a blend of con(structed) and lang(uage), dates only from around 1991, but the idea of an artificially constructed international auxiliary language has been around since at least the second half of the 19th century. The most famous of these 19th-century conlangs is Esperanto (invented in 1887); other such languages include Volapük (invented about 1879). Twentieth-century conlangs include Ido, derived from Esperanto and developed in 1907; Interlingua (developed between 1924 and 1951); and the half dozen or so languages that J.R.R. Tolkien invented for his trilogy Lord of the Rings. Speakers of conlangs range from those who would like to see them in wide use, e.g., Esperanto, to the aficionados of sci-fi conventions, who delight in the extravagances of, say, Klingon.