Where English is not the main language it is the secondary
language. Auxiliary meaning secondary or supporting
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An auxiliary language is any of various languages used for
intercommunication by speakers of various other languages.
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Sydelle Pulaski wrote her shorthand notes in Esperanto, a constructed international auxiliary language designed for easy learning and use. This language choice added an extra layer of complexity to the puzzle presented in "The Westing Game."
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English is the International Trade Language.
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There is no concensus, but in general, English is known as an
International language.