/ ˌdaɪəgˈnəʊsɪs; NAmE -ˈnoʊ-/ noun
[ C , U ] ( pl. diag·noses / -siːz; NAmE /) diagnosis (of sth) the act of discovering or identifying the exact cause of an illness or a problem :
diagnosis of lung cancer
They are waiting for the doctor's diagnosis.
An accurate diagnosis was made after a series of tests.
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WORD ORIGIN
late 17th cent.: modern Latin , from Greek , from diagignōskein distinguish, discern, from dia apart + gignōskein recognize, know.