In linguistics and foreign language teaching, there are various terms to describe languages one knows or is learning, e.g.:
- L1, first language, native language, mother tongue; a language one acquired from birth.
- L2, second language; a language one learned or is learning, it not their mother tongue.
- Target language, in the context of language learning, the language one is trying to learn.
What term can be used to describe a language that a subject does not know, they are not currently learning, and it is not their "target" of study?
- The term should be fairly precise, such that readers can readily recognize that this term is neither a L1 nor a target language nor a partially learned language.
- A term used in academic writing in the fields of linguistics, foreign language teaching, or second language acquisition studies is preferred, but if none is available, a new term that is consistent enough to fit in a set along with the other examples will be fine.