- to determine the identity of (a disease, illness, etc.) by a medical examination: The doctor diagnosed the illness as influenza.
- to ascertain the cause or nature of (a disorder, malfunction, problem, etc.) from the symptoms: The mechanic diagnosed the trouble that caused the engine knock.
- to classify or determine on the basis of scientific examination.
- to make a diagnosis.
- to determine or distinguish by diagnosis
- to examine (a person or thing), as for a disease
