Diagnose (verb)

1. Identify the nature of (an illness or other problem) by examination of the symptoms.
2. Determine the cause or nature of (a disease or medical condition).
3. To identify the cause of a particular problem or illness through examination, testing, or medical evaluation.
4. To recognize a particular problem or illness by analyzing symptoms.
5. To determine the cause of a medical condition by examination and testing.

Origin:

Mid 16th century: from greek diagignōskein "distinguish, recognize", from dia- "thoroughly" + gignōskein "know".

Examples:

1. The doctor diagnosed her with the flu.
2. He was diagnosed with cancer.
3. She was unable to diagnose the problem.
4. The physician diagnosed the patient with a broken arm.
5. The mechanic was able to diagnose the problem with the car.