an artificial language, devised for machine translation, that makes explicit the distinctions necessary for successful translation into a target language, even where they are not present in the source language.
(Interlingua) [mass noun] an artificial international language formed of elements common to the Romance languages, designed primarily for scientific and technical use.
early 20th century: from inter- 'between' + Latin lingua 'tongue'
interlingua in other Oxford dictionaries
Definition of interlingua in the US English dictionary