Diagnosis is the discovery and naming of what is wrong with someone who is ill or with something that is not working properly.
例句
I need to have a second test to confirm the diagnosis...我需要再進行一次檢查以確診。Symptoms may not appear for some weeks, so diagnosis can be difficult.癥狀可能在幾周里都不會出現，所以診斷起來會比較困難。
英漢詞典釋義
n.
〈醫〉診斷法; 診斷結論
What was the doctor's diagnosis of your disease?醫生對你的病作出了什么診斷？
英英詞典釋義
Noun
1. identifying the nature or cause of some phenomenon