English: ESL
Spanish: (USA) inglés como segunda lengua, (worldwide) inglés como lengua extranjera
Definition (English):—
Definition (Spanish):—
Comments:In Spanish, the native formation to describe this concept is "(name of language) como lengua extranjera"; for example, the Cervantes Institute's "Diploma del Español como Lengua Extranjera". However, due to the solid collocation within American English of "English as a Second Language", there is broad usage of "inglés como segunda lengua". Interestingly, "idioma" does not seem to be preferred when expressing this concept.