noun
diagnosis
dye-ug-NOH-sis/ˌdaɪəɡˈnəʊsɪs/
Identification of the nature or cause of a disease or problem.
The physician uses the scan and examination to make a diagnosis.

Etymology
The pieces express knowing thoroughly or knowing things apart. This became discerning or distinguishing, then specifically recognizing a disease by the symptoms that distinguish it.
In context
… this is a diagnosis that can be made by history the patient will give you the history if you ask the right questions …
More examples
- Further tests were needed for a firm diagnosis.
- Her diagnosis identified the source of the pain.
- The technician's diagnosis traced the fault to a loose connection.
Forms
diagnosis · diagnoses
diagnose verb — identify a disease or problem
diagnostic adjective — helping identify a cause
Similar words
- assessment
- A broader evaluation rather than identification of a cause.
- identification
- Recognition of what something is, not necessarily a medical process.