ENGLISH
REFERENCE

diagnosis

n. C / U
C1 Advanced Oxford US //ˌdaɪəɡˈnoʊsəs// UK //dˌaɪəɡnˈəʊsɪs// di·ag·no·sis Archaic Dialect

n. the act of identifying a medical problem or illness after an examination. You receive this from a doctor when they tell you exactly what is making you sick.

n. the identification of the nature of an illness or other problem by examination of the symptoms. Often used in a clinical context to describe the formal conclusion reached by a medical professional.


SIMPLE

The doctor gave her a diagnosis of asthma.

CONTEXTUAL

After several blood tests and an X-ray, the medical team finally reached a definitive diagnosis.

COMPLEX

Early diagnosis is crucial for improving patient outcomes, as many chronic conditions respond more effectively to treatment when caught in their initial stages.

Synonyms
Origin

From Latin diagnōsis, from Ancient Greek διάγνωσις (diágnōsis), from διαγιγνώσκω (diagignṓskō, “to discern”), from διά (diá, “through”) + γιγνώσκω (gignṓskō, “to know”).

Usage

The plural form is 'diagnoses'. It is frequently followed by the preposition 'of' when naming the specific condition.

Pitfall

The doctor diagnosed her a flu.The doctor gave her a diagnosis of flu.Learners often confuse the verb 'diagnose' (which takes the person as the object) with the noun 'diagnosis' (which takes the illness as the object of 'of').

© 2026 English Reference