community language

noun2

1. •
   An unofficial language spoken by a minority of people.

   • Commonly spoken community languages in Australia include Cantonese, Mandarin, Vietnamese, Arabic, Greek, Italian, indigenous languages, and so on.
2. •
   An unofficial language spoken as a local lingua franca among people of diverse ethno-linguistic backgrounds.

   • Such languages, which serve the purposes of general communication over fairly wide areas within countries, are what are referred to as the community languages of Africa. — 1985

noun1

1. •
   Any of the official languages of the European Union.