noun
a test or analysis to determine the composition or quality of a substance
verb
to analyze or examine something in order to determine its quality or nature
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The scientist conducted an assay to determine the concentration of the compound in the sample.
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The lab tech ran an assay to check the levels of the drug in the blood sample.
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I heard they're doing an assay on that new supplement to see if it actually works.
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She performed a mental assay of her feelings before making a decision.