the most suitable language to deal with diplomacy and international communication at a particular period in time.

the language which, due to its power to facilitate intercultural communication, becomes dominant in the globe or in certain areas of it.

the combination of anyone native language and English, resulting in a novel manifestation of the English language aimed at promoting easier communication.

a language which, at a certain time period, is widely adopted for communication between speakers whose native languages are different from each other’s.

the language with the largest number of speakers around the world at a specific historical period.