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v. di·ag·nosed, di·ag·nos·ing, di·ag·nos·es
1. To distinguish or identify (a disease, for example) by diagnosis.
2. To identify (a person) as having a particular disease or condition by means of a diagnosis.
3. To analyze the nature or cause of: diagnose the reasons for an economic downturn.
To make a diagnosis.
[Back-formation from diagnosis.]