1. an appraisal of the state of affairs
- they made an assay of the contents
Similar word(s): check
2. a substance that is undergoing an analysis of its components
Definition categories: substance
3. a written report of the results of an analysis of the composition of some substance
4. 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.