• a quantitative or qualitative test of a substance (especially an ore or a drug) to determine its components; frequently used to test for the presence or concentration of infectious agents or antibodies etc.
• an appraisal of the state of affairs; "they made an Assay of the contents"; "a check on its dependability under stress"
• a written report of the results of an analysis of the composition of some substance
• a substance that is undergoing an analysis of its components
• analyze (chemical substances)
• make an effort or attempt; "He tried to shake off his fears"; "The infant had essayed a few wobbly steps"; "The police attempted to stop the thief"; "He sought to improve himself"; "She always seeks to do good in the world"

'Assay' in other languages