Meaning of “diagnosis” in the English Dictionary

"diagnosis" in British English

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diagnosisnoun [ C or U ]

uk /ˌdaɪ.əɡˈnəʊ.sɪs/ us /ˌdaɪ.əɡˈnoʊ.sɪs/ plural diagnoses

C2 a judgment about what a particular illness or problem is, made after examining it:

"What was the diagnosis?" "Arthritis in both joints."
The doctor has made an initial diagnosis.
Diagnosis of the disease is difficult in the early stages.

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(Definition of “diagnosis” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"diagnosis" in American English

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diagnosisnoun [ C/U ]

us /ˌdɑɪ·ɪɡˈnoʊ·sɪs/ plural diagnoses /ˌdɑɪ·ɪɡˈnoʊˌsiz/

the making of a judgment about the exact character of a disease or other problem, esp. after an examination, or such a judgment:

[ U ] Respiratory therapy involves the diagnosis and treatment of breathing disorders.
diagnostic
adjective us /ˌdɑɪ·ɪɡˈnɑs·tɪk/

The hospital is doing some diagnostic tests to see if they can figure out why she’s running a fever.

(Definition of “diagnosis” from the Cambridge Academic Content Dictionary © Cambridge University Press)