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 Duke first shared her bipolar diagnosis with the world in her 1987 memoir, Call Me Anna, and worked to raise awareness for mental health until her death. Kara Warner, PEOPLE.com, "Sean Astin Says Mom Patty Duke's Mental Illness Led Him to Advocate: 'There's No Judgment'," 8 July 2020 After being placed in a medically induced coma early in his diagnosis, Cordero underwent a leg amputation, the insertion of a tracheostomy tube, and the implantation of a temporary pacemaker. Rosy Cordero, EW.com, "Nick Cordero, Tony-nominated Broadway actor, dies from coronavirus complications at 41," 6 July 2020 When Casey arrived at St. Anthony's Hospital, his diagnosis was grim. Peter Van Sant, CBS News, "Casey Kasem's wife, children accused each other of "killing" radio icon," 4 July 2020 But the hostess was slow to share her diagnosis with her circle — fearful of the social fallout, according to some friends, as much as the virus. Washington Post, "The virus didn’t stop a Washington socialite from throwing a backyard soiree. Then the tests came back positive.," 1 July 2020 Her diagnosis meant Cambron now had to take insulin, just as her mom did. Corey J. Maloney, Health.com, "Type 2 Diabetes Prompted This Woman to Give Up the Unhealthy Eating Traditions She'd Grown Up With," 30 June 2020 Whittier’s family prior to his death and postmortem CTE diagnosis filed a federal court suit on his behalf that was rolled into a multi-district case being heard in Illinois. David Barron, ExpressNews.com, "Family of UT pioneer Julius Whittier sues NCAA over head trauma," 30 June 2020 Since his original diagnosis, Cordero has tested negative for the virus but suffered from a lung infection at the end of last month and remains on a ventilator. Hannah Yasharoff, USA TODAY, "Amanda Kloots 'couldn't keep it together' as husband Nick Cordero hits 90 days in the hospital," 30 June 2020 While Covid-19-era behaviors may look like clinical OCD, there are key distinctions between protective behaviors in the face of a clear and present danger like a pandemic and a clinical diagnosis of OCD. David Rosenberg, CNN, "Excessive hand-washing. Tech addiction. Behaviors once considered extreme are now crucial to protect us amid a dangerous pandemic," 29 June 2020

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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Time Traveler for diagnosis

Time Traveler

The first known use of diagnosis was in 1634

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Statistics for diagnosis

Last Updated

11 Jul 2020

Cite this Entry

“Diagnosis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diagnosis. Accessed 12 Jul. 2020.

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More Definitions for diagnosis


How to pronounce diagnosis (audio)

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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