The difference between Bilingual and Quadrilingual
When used as nouns, bilingual means a person who is able to use two languages, whereas quadrilingual means a person who understands four languages.
When used as adjectives, bilingual means having the ability to speak two languages, whereas quadrilingual means written in four languages.
check bellow for the other definitions of Bilingual and Quadrilingual
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Bilingual as an adjective:
Having the ability to speak two languages.
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Bilingual as an adjective:
Spoken or written in two different languages.
Examples:
"a bilingual dictionary"
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Bilingual as an adjective:
Characterized by the use or presence of two languages.
Examples:
"'bilingual education"
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Bilingual as a noun:
A person who is able to use two languages.
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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.