The new definition is included in the latest edition of the Atlas of the World's Languages in danger, compiled by the United Nations group Unesco.

BBC: Cornish language no longer extinct, says UN

The atlas is designed to highlight awareness of languages in danger around the world and was compiled by 30 linguists.

BBC: Cornish language no longer extinct, says UN

Since 1976, Paul Kay of the University of California, Berkeley, another of the paper's authors, has compiled a database of information about how 110 different languages assign colour adjectives to 330 different hues.

ECONOMIST: Psychology