Definition of diagnosis noun from the Oxford Advanced American Dictionary

 

diagnosis

 noun
noun
NAmE//ˌdaɪəɡˈnoʊsəs//
 
[countable, uncountable](pl. diagnoses
NAmE//ˌdaɪəɡˈnoʊsiz//
 
)
diagnosis (of something)
 
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the act of discovering or identifying the exact cause of an illness or a problem a diagnosis of lung cancer They are waiting for the doctor's diagnosis. An accurate diagnosis was made after a series of tests.
See the Oxford Advanced Learner's Dictionary entry: diagnosis