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

And due to Dave Mustaine’s recent cancer diagnosis, Megadeth canceled all its shows, including its Summerfest appearance July 4, leading to a dark night in Summerfest's amphitheater for the first time in festival history. Piet Levy, Milwaukee Journal Sentinel, "The best and worst of Summerfest 2019 in Milwaukee, from Billie Eilish to Jennifer Lopez," 8 July 2019 The highest rate of CTE was in football players who participated beyond high school: Ten of 15 collegiate and professional players showed either some features of CTE or definitive diagnoses. Sabine Galvis, Science | AAAS, "Even if you don’t play contact sports, you could develop signs of traumatic brain injury," 3 July 2019 Children have been barred from attending their zoned schools or have been transferred after diagnosis to schools with nurses, previous reporting by The Times has found. Christine Hauser, New York Times, "Utah Family Sues After Son With Diabetes Is Kept From School," 29 June 2019 The clues to diagnosis are that the damage is on the highest point on each fruit, a place not covered by leafy growth. oregonlive.com, "Ask an Expert: Remove sunburned plums now for a better harvest later," 28 June 2019 Polchin wonders if the men, many of whom were veterans of the First World War, were in shell shock—though an exact diagnosis now hardly matters. Caleb Crain, The New Yorker, "The Theory That Justified Anti-Gay Crime," 20 June 2019 Since revealing her multiple sclerosis (MS) diagnosis in October, actress Selma Blair has been incredibly open on social media about how the disease has affected her everyday life. Rachel Lubitz, refinery29.com, "Selma Blair Shaves Her Head With Help From Her 7-Year-Old Son," 18 June 2019 Already nine months had been wasted after a wrong diagnosis. Lisa J. Huriash, sun-sentinel.com, "Lisa Boccard, breast cancer advocate, dies at 57," 10 June 2019 The cub is Shanti’s eighth birth, having previously welcomed two cubs in 2012, two in 2014 and three in 2016 with her previous mate, Roscoe, who was euthanized in July 2017 after a cancer diagnosis. Robin Goist, cleveland.com, "Snow leopard cub born at Akron Zoo," 5 June 2019

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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Statistics for diagnosis

Last Updated

12 Jul 2019

Look-up Popularity

Time Traveler for diagnosis

The first known use of diagnosis was in 1634

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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 diagnoses (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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