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Discover LudwigThe word "interlanguage" is correct and usable in written English.
You can use the term when referring to a language system which is formed and used by second language learners as they learn a foreign language. An example sentence could be: "The learners created an interlanguage to aid in their understanding of the new language."
Dictionary
interlanguage
noun
A language generated by a student of an additional language that incorporates aspects of their native language and the target language.
synonyms
Exact(3)
Diakonoff accounted for the considerable linguistic diversity of Afro-Asiatic languages by suggesting that there was extensive interethnic and interlanguage contact throughout the region.
English is the world's biggest interlanguage.
Zamenhof's "neutral interlanguage", said the manual, had been chosen because it was "not identifiable with any alliance or ideology" and was "far easier to learn and use than any national language".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com