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

But his statements help break down some of the stigma regardless of a diagnosis. Brittney Mcnamara, Teen Vogue, "Lil Xan Said He Wants to Get Sober After Mac Miller's Death," 10 Sep. 2018 Obviously, cue the guilt about how Amma doesn’t need her anymore—make a lot of sense in light of the MBP diagnosis. Cady Drell, Marie Claire, "The 10 Biggest Moments From 'Sharp Objects' Episode 7," 20 Aug. 2018 Nearly 30,000 men die from prostate cancer each year, with about 1 in 10 cases spreading beyond the prostate at the time of diagnosis. Jill Tucker, SFChronicle.com, "Aggressive, deadly type of prostate cancer occurs at higher rate than previously thought," 9 July 2018 Depending on the timing and severity of the diagnosis, delaying chemotherapy for the sake of egg collection may be inadvisable. Katherine J. Wu, Smithsonian, "How Artificial Ovaries Could Expand Fertility Options For Chemo Patients," 5 July 2018 Their story describes the anguish of cancer diagnosis, treatments and unexpected effects and shows what family members and caregivers can experience during these challenges. Linda Mcintosh, sandiegouniontribune.com, "Daughters of American Revolution install officers," 4 July 2018 In other instances, administrative contractors have set arbitrary levels on the types and numbers of tests that can be performed each day in certain regions — risking the accuracy of a patient’s diagnosis. Scott Whitaker, STAT, "It’s time to reform the process for determining what Medicare covers," 27 June 2018 Generally, parents felt unprepared for the emotional impact of the diagnosis on themselves, the sick child’s siblings, and the family as a whole. Erica Sood, Phd, Philly.com, "Fathers of seriously ill children experience stress differently than mothers," 27 June 2018 New Jersey veteran Brian Boyle won the Masterton Trophy for perseverance and dedication to hockey after putting together an All-Star season in the wake of his cancer diagnosis and healthy problems for his young son. Greg Beacham, Houston Chronicle, "Devils' Taylor Hall wins NHL MVP award," 20 June 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

15 Nov 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

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an inexhaustible supply or amount

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