What is the term for a language that is a second language for most of the people that use it? For example, when the Portuguese traded with East African countries in the 1700's, none of them spoke their mother tongue. English can also been seen as this type of language. It is two words and sounds Latin.
lin·gua fran·ca \ˈliŋ-gwə-ˈfraŋ-kə\
: a language that is used among people who speak various different languages
often capitalized : a common language consisting of Italian mixed with French, Spanish, Greek, and Arabic that was formerly spoken in Mediterranean ports
: any of various languages used as common or commercial tongues among peoples of diverse speech
: something resembling a common language
Plural: lingua francas or lin·guae fran·cae -gwē-ˈfraŋ-(ˌ)kē\
English is used as a lingua franca among many airline pilots.
Origin: Italian, literally, Frankish language.
First use: 1619