diagnostic in English

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adj. 1. of or having to do with diagnosis.
Ex. a diagnostic approach to the problems of education.
2. helping in diagnosis; serving to indicate the nature or character of anything, as of a disease.
Ex. diagnostic tests.

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diagnostic, adjective, noun.

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noun 1. Also, diagnostics. diagnosis, especially as an art or science.
2. a symptom or characteristic of value in diagnosis.
Ex. Her pallor was a diagnostic.