di·​ag·​no·​sis | \ ˌdī-ig-ˈnō-səs How to pronounce diagnosis (audio) , -əg- \
plural diagnoses\ ˌdī-​ig-​ˈnō-​ˌsēz How to pronounce diagnosis (audio) , -​əg-​ \

Definition of diagnosis

1a : the art or act of identifying a disease from its signs and symptoms
b : the decision reached by diagnosis the doctor's diagnosis
2a : investigation or analysis of the cause or nature of a condition, situation, or problem diagnosis of engine trouble
b : a statement or conclusion from such an analysis
3 biology : a concise technical description of a taxon

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Examples of diagnosis in a Sentence

The unusual combination of symptoms made accurate diagnosis difficult. She is an expert in the diagnosis and treatment of eye diseases. The diagnosis was a mild concussion. His doctor made an initial diagnosis of pneumonia. The committee published its diagnosis of the problems affecting urban schools.
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Recent Examples on the Web That mole might just require a referral to a dermatologist, or that headache could be a sign of dental problems that require further diagnosis and care. Katia Hetter, CNN, 3 June 2021 Definitive diagnosis requires a CT (computerized tomography) scan or biopsy and examination by a pathologist. Judy Stone, Forbes, 3 June 2021 The result is that our medical program will finance more than fifty thousand abortions of unwed mothers in the coming year on such flimsy diagnosis. Time, 1 June 2021 Crawford became a friend of the Heller family after being introduced by Giants vice chairman Rob Dean, who informed him of Heller’s diagnosis. John Shea, San Francisco Chronicle, 31 May 2021 Padden said Livingston's diagnosis is unresponsive wakefulness syndrome. Rochelle Olson, Star Tribune, 28 May 2021 Her brother Luke’s leukemia diagnosis cast a dark cloud across everything. Los Angeles Times, 27 May 2021 But the film is also about Lindgren’s scary 2014 diagnosis with a baseball-sized brain tumor, which challenged his at-all-costs commitment to a high-adrenaline career. Erin Berger, Outside Online, 27 May 2021 One piece of legislation bans abortions sought on the basis of a Down syndrome diagnosis and the other prohibits conducting abortions if a physician detects a fetal heartbeat. Rick Klein, Averi Harper, ABC News, 27 May 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'diagnosis.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of diagnosis

1634, in the meaning defined at sense 1a

History and Etymology for diagnosis

New Latin, from Greek diagnōsis, from diagignōskein to distinguish, from dia- + gignōskein to know — more at know

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Learn More about diagnosis

Time Traveler for diagnosis

Time Traveler

The first known use of diagnosis was in 1634

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Statistics for diagnosis

Last Updated

6 Jun 2021

Cite this Entry

“Diagnosis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diagnosis. Accessed 16 Jun. 2021.

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More Definitions for diagnosis



English Language Learners Definition of diagnosis

: the act of identifying a disease, illness, or problem by examining someone or something
: a statement or conclusion that describes the reason for a disease, illness, or problem


di·​ag·​no·​sis | \ ˌdī-əg-ˈnō-səs How to pronounce diagnosis (audio) \
plural diagnoses\ -​ˌsēz \

Kids Definition of diagnosis

1 : the act of recognizing a disease from its signs and symptoms She specialized in the diagnosis and treatment of eye diseases.
2 : the conclusion that is reached following examination and testing The diagnosis was pneumonia.


di·​ag·​no·​sis | \ ˌdī-ig-ˈnō-səs, -əg- How to pronounce diagnosis (audio) \
plural diagnoses\ -​ˌsēz How to pronounce diagnosis (audio) \

Medical Definition of diagnosis

1a : the art or act of identifying a disease from its signs and symptoms
b : the decision reached by diagnosis a diagnosis of pneumonia
2 : a concise technical description of a taxon


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