di·ag·no·sis | \ ˌdī-ig-ˈnō-səs , -əg- \
plural diagnoses\-ˌsēz \

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 was in June, a few weeks after the pair wrapped up their college golfing careers and 13 years since Musselman had introduced Jones to the sport in the wake of an earth-shattering medical diagnosis. Danielle Lerner, The Courier-Journal, "Louisville golfer and caddie team up for Kentucky's PGA tournament," 12 July 2018 The other thing that makes an MG diagnosis difficult is that, like other STIs, MG often has no symptoms—especially in women. Amanda Macmillan, Health.com, "What Is Mycoplasma Genitalium? British Doctors Are Warning That This Sexually Transmitted Infection Could Be the Next Big Superbug," 11 July 2018 But an Alzheimer’s diagnosis can also lead to other changes in the way people travel. Cassie Shortsleeve, Condé Nast Traveler, "What It’s Really Like to Travel With Alzheimer’s," 28 June 2018 In fact, men and women are equally responsible for an infertility diagnosis. Brennan Peterson, chicagotribune.com, "5 myths about infertility," 26 June 2018 But not all agree that an official diagnosis is needed. Natalie Dreier, ajc, "World Health Organization declares gaming disorder official condition, publishes diagnosis criteria," 19 June 2018 This could explain why women decline more rapidly after an Alzheimer’s diagnosis — it may be detected at a more advanced stage, limiting the opportunity for and impact of early intervention. Amy M. Miller, STAT, "Studying sex differences will improve health for women and men," 13 June 2018 However, an official diagnosis and prognosis has not yet been determined. baltimoresun.com, "Digest: Matzohball run will benefit Ellicott City flood victims," 2 June 2018 There’s no cure or vaccine for HIV, but the discovery of antiretroviral treatments turned an HIV diagnosis from a death sentence into a chronic illness. Julia Belluz, Vox, "A primer for Donald Trump: HIV and HPV are completely different viruses," 18 May 2018

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

6 Sep 2018

Look-up Popularity

Time Traveler for diagnosis

The first known use of diagnosis was in 1634

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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 \
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- \
plural diagnoses\-ˌsēz \

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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Comments on diagnosis

What made you want to look up diagnosis? Please tell us where you read or heard it (including the quote, if possible).


alleviating pain or harshness

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