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
Tragically, a third of people with the condition die before receiving a diagnosis.
—
Alyce Collins, MSNBC Newsweek, 15 Nov. 2025
However, new details emerged of what happened before his diagnosis was announced to the world and his family’s immediate reactions.
—Lea Veloso, StyleCaster, 15 Nov. 2025
And the need is high — autism diagnosis rates in the country have risen over the past two decades.
—Miami Herald, 15 Nov. 2025
Alpha-gal allergy is a reportable diagnosis in only three states – Arkansas, Tennessee and Virginia – so the actual number of cases in the US is not known.
—Brenda Goodman, CNN Money, 14 Nov. 2025
See All Example Sentences for diagnosis
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Alyce Collins, MSNBC Newsweek, 15 Nov. 2025
However, new details emerged of what happened before his diagnosis was announced to the world and his family’s immediate reactions.
—Lea Veloso, StyleCaster, 15 Nov. 2025
And the need is high — autism diagnosis rates in the country have risen over the past two decades.
—Miami Herald, 15 Nov. 2025
Alpha-gal allergy is a reportable diagnosis in only three states – Arkansas, Tennessee and Virginia – so the actual number of cases in the US is not known.
—Brenda Goodman, CNN Money, 14 Nov. 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 17 Nov. 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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