The difference between Monolingual and Quadrilingual
When used as nouns, monolingual means a person who knows or uses only a single language, whereas quadrilingual means a person who understands four languages.
When used as adjectives, monolingual means knowing or using a single language, whereas quadrilingual means written in four languages.
check bellow for the other definitions of Monolingual and Quadrilingual
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Monolingual as an adjective:
Knowing or using a single language.
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Monolingual as a noun:
A person who knows or uses only a single language; a monoglot.
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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.