accent
received pronunciation
lingua franca
bilingual
fluency
native speaker
accuracy
a non-regional British accent spoken by members of the upper class, often regarded as the ‘typical’ British accent (also known as ‘BBC English’ or ‘the queen’s English’)
differences in the way people who speak the same language pronounce words.
the ability to speak or write a language easily, well, and quickly
the ability to speak two languages fluently and accurately
a language adopted by people who speak different languages as a common form of communication
the ability to use language correctly, without mistakes
someone whose language was acquired from birth, rather than learned later in life