What does "interlanguage" mean?

A language generated by a student of a foreign language that incorporates aspects of their native language and the target language.

How do you pronounce "interlanguage"?

Pronounced //ɪnˈtɜɹˈlæŋɡwɪd͡ʒ//.

Common synonyms include: fixed interlanguage, interlanguage system, jargon, koine, learner language, lingua franca.

/ɪnˈtɜɹˈlæŋɡwɪd͡ʒ/ noun

noun ·Rare ·Advanced level

Noun

1
A language generated by a student of a foreign language that incorporates aspects of their native language and the target language.
"Trasyanka and Surzhyk are interlanguages: a Belarusian–Russian and a Ukrainian–Russian mixed language."
2
a common language used by speakers of different languages wordnet
3
A lingua franca, a common language used by speakers of different languages
"Latin used to be the European interlanguage. Currently English widely serves this purpose."
4
A pidgin or creole

"If you like Lojban, maybe read the research paper "Lojban as a Machine Translation Interlanguage in the Pacific.""

From inter- + language. In the language acquisition sense introduced by Larry Selinker in 1972.