Meaning : An appraisal of the state of affairs.
Example :
They made an assay of the contents.
A check on its dependability under stress.
Synonyms : check
Meaning : A substance that is undergoing an analysis of its components.
Meaning : A written report of the results of an analysis of the composition of some substance.
Meaning : 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..