Constructed languages introduced in the 1940s

In the 1949 dystopian novel Nineteen Eighty-Four (also published as 1984), by George Orwell, Newspeak is the fictional language of Oceania, a totalitarian superstate. To meet the ideological requirements of Ingsoc (English Socialism) in Oceania, the Party created Newspeak, a controlled language of simplified grammar and restricted vocabulary designed to prevent people from being able to think critically. The Newspeak language thus limits the person's ability to articulate and communicate abstract concepts, such as personal identity, self-expression, and free will, which are thoughtcrimes, acts

Sindarin is one of the constructed languages devised by J. R. R. Tolkien for use in his fantasy stories set in Arda, primarily in Middle-earth. Sindarin is one of the many languages spoken by the Elves.

fictional language in the fantasy works of J. R. R. Tolkien

Interglossa (lit. "between + language") is a constructed language devised by biologist Lancelot Hogben during World War II, as an attempt to put the international lexicon of science and technology, mainly of Greek and Latin origin, into a language with a purely isolating grammar. Interglossa was published in 1943 as just a draft of an auxiliary. Hogben applied semantic principles to provide a reduced vocabulary of just over 880 words which might suffice for basic conversation among peoples of different nationality.

Blissymbols or Blissymbolics is a constructed language conceived as an ideographic writing system called Semantography consisting of several hundred basic symbols, each representing a concept, which can be composed together to generate new symbols that represent new concepts.

international auxiliary language

Speedtalk is a fictional constructed language and key plot device in Robert A. Heinlein's novella Gulf (1949). Speedtalk is a logic-based language with complex syntax, minimal vocabulary, and a rich phoneme inventory (written with letters such as œ, ħ, ø, and ʉ); it would make both communication and thought more efficient and precise. A single phoneme indicates a word, so a "word" indicates a sentence. In the only example given, a "word" means "The far horizons draw no nearer."