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 Early diagnosis will be critical for aducanumab or similar drugs that clear away clumps of a misshapen protein called beta-amyloid. Usha Lee Mcfarling, STAT, 7 June 2021 Among the maddening aspects of Lou Gehrig’s disease is that for most patients, the only diagnosis is to rule out all other possibilities. New York Times, 1 June 2021 Before surgery, or if the diagnosis is unclear, further testing often includes an EMG (electromyography) and nerve conduction studies. Dr. Keith Roach, oregonlive, 28 May 2021 These symptoms are similar to symptoms of infections and other autoimmune diseases such as rheumatoid arthritis, so a diagnosis can be tricky. Matt Villano, CNN, 10 May 2021 For the snorer, Haden and Barron’s concert and Wolochow’s subsequent diagnosis — thanks to the venue’s pristine acoustics — was not just magical, but transformative. George Varga, San Diego Union-Tribune, 9 May 2021 Garcia’s official diagnosis was viral enteritis, per the A’s. Matt Kawahara, San Francisco Chronicle, 4 May 2021 But with bonuses in the balance, there was pressure to treat even when the diagnosis wasn’t firm. Sandeep Jauhar, WSJ, 28 Apr. 2021 The diagnosis is Proteus syndrome, made famous by Joseph Merrick, the Elephant Man. Gemma Sieff, Harper's Magazine, 27 Apr. 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

18 Jun 2021

Cite this Entry

“Diagnosis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diagnosis. Accessed 24 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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