diagnosis di·ag·no·sis (dī'əg-nō'sĭs)
n. pl. di·ag·no·ses (-sēz)
The act or process of identifying or determining the nature and cause of a disease or injury through evaluation of patient history, examination, and review of laboratory data.
The opinion derived from such an evaluation.
A brief description of the distinguishing characteristics of an organism, as for taxonomic classification.