Interlingua -
an artificial language proposed for use as an auxiliary international language; based on words common to English and the Romance languages
Interlingua (ISO 639 language codes ia, ina) is an international auxiliary language (IAL), developed between 1937 and 1951 by the International Auxiliary Language Association (IALA). It is the second or third most widely used IAL, after Esperanto and perhaps Ido, and the most widely used naturalistic IAL: in other words, its vocabulary, grammar and other characteristics are largely derived from natural languages. Interlingua was developed to combine a simple, mostly regular grammar with a vocabulary common to the widest possible range of languages, making it unusually easy to learn, at least for those whose native languages were sources of Interlingua's vocabulary and grammar.
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Interlingua An international auxiliary language (IAL) published in 1951 by the International Auxiliary Language Association (IALA).