What does the word Swahili mean, and what does the origin of this word tell us about the culture of the East African coast?

The Swahili language, is basically of Bantu (African) origin. ... The word "Swahili" was used by early Arab visitors to the coast and it means "the coast". Ultimately it came to be applied to the people and the language.

Explanation:

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Swahill mass noun A Bantu language widely used as a lingua franca in East Africa and having official status in several countries. There are probably fewer than 2 million native speakers, but it is in everyday use by over 20 million.  Also called Kiswahili. As regards the formation of the Swahili culture and language, some scholars attribute these phenomena to the intercourse of African and Asiatic people on the coast of East Africa. The word "Swahili" was used by early Arab visitors to the coast and it means "the coast". Ultimately it came to be applied to the people and the language.