Englishfor English speakers
unique
Adjective
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If something is unique, it is one of a kind; it is unmatched.
When the school for the deaf opened, it was unique in Europe.
Of course, the problem is not unique to this country.
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If something is unique, it is rare or unusual.
Oh, thank you! What a unique gift!
Living in Japan was a unique experience.
specialization
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noun
the act of specializing; making something suitable for a special purpose
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noun
(= specialisation)
the special line of work you have adopted as your career
his specialization is gastroenterology
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noun
(= differentiation)
(biology) the structural adaptation of some body part for a particular function
cell differentiation in the developing embryo