The difference between Multilingual and Quadrilingual
When used as nouns, multilingual means a polyglot, whereas quadrilingual means a person who understands four languages.
When used as adjectives, multilingual means pertaining to multiple languages, whereas quadrilingual means written in four languages.
check bellow for the other definitions of Multilingual and Quadrilingual
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Multilingual as an adjective:
Pertaining to multiple languages.
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Multilingual as an adjective (of a person):
able to communicate fluently in multiple languages
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Multilingual as a noun:
A polyglot
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Quadrilingual as an adjective:
Written in four languages.
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Quadrilingual as an adjective:
Able to speak four languages.
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Quadrilingual as a noun:
A person who understands four languages.