diagnosis
noun
di·ag·no·sis
ˌdī-ig-ˈnō-səs 
-əg-
plural diagnoses
ˌdī-ig-ˈnō-ˌsēz
-əg-
1
a
: the art or act of identifying a disease from its signs and symptoms
b
: the decision reached by diagnosis
the doctor's diagnosis
2
a
: 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
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.
Recent Examples on the Web
Following the alleged incident, Dixon says his mental and physical health deteriorated, leading to a diagnosis of PTSD.
—
Amber Corrine, VIBE.com, 18 June 2025
Bibi’s reemergence onto the scene after a cancer diagnosis celebrated not just his recovery but an ongoing partnership with The Surf Lodge.
—Alissa Fitzgerald, Forbes.com, 18 June 2025
Her case was separated because of a cancer diagnosis.
—Sarah D. Wire, USA Today, 18 June 2025
The lawsuit says the PTSD was a new diagnosis after the incident with the Chucky doll at the bank.
—Catherine Muccigrosso, Charlotte Observer, 17 June 2025
See All Example Sentences for diagnosis
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Amber Corrine, VIBE.com, 18 June 2025
Bibi’s reemergence onto the scene after a cancer diagnosis celebrated not just his recovery but an ongoing partnership with The Surf Lodge.
—Alissa Fitzgerald, Forbes.com, 18 June 2025
Her case was separated because of a cancer diagnosis.
—Sarah D. Wire, USA Today, 18 June 2025
The lawsuit says the PTSD was a new diagnosis after the incident with the Chucky doll at the bank.
—Catherine Muccigrosso, Charlotte Observer, 17 June 2025
See All Example Sentences for diagnosis
Cite this Entry
“Diagnosis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diagnosis. Accessed 24 Jun. 2025.
Copy CitationKids Definition
diagnosis
noun
di·ag·no·sis
ˌdī-ig-ˈnō-səs
plural diagnoses
-ˈnō-ˌsēz
1
a
: the art or act of identifying a disease from its signs and symptoms
b
: the decision reached by diagnosis
2
a
: a careful study of something especially to determine its nature or importance
b
: the conclusion reached after a study or examination
Medical Definition
diagnosis
noun
di·ag·no·sis
ˌdī-ig-ˈnō-səs, -əg-
plural diagnoses
-ˌsēz
1
a
: 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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