The difference between Quadrilingual and Trilingual
When used as nouns, quadrilingual means a person who understands four languages, whereas trilingual means a trilingual person.
When used as adjectives, quadrilingual means written in four languages, whereas trilingual means able to read or speak three languages.
check bellow for the other definitions of Quadrilingual and Trilingual
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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.
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Trilingual as an adjective:
Able to read or speak three languages.
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Trilingual as an adjective:
Expressed or written in three languages.
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Trilingual as a noun:
A trilingual person.