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
The team predicts that, within five years, blood tests for early Parkinson’s diagnoses could become more common within clinical practice.
—
Angelica Stabile, FOXNews.com, 31 Jan. 2026
Since Millie's diagnosis, her grandparents, Sue and Brian, have been sharing updates about her treatment on a GoFundMe page.
—Brian Anthony Hernandez, PEOPLE, 31 Jan. 2026
Just in 2024 alone, it was reported that over eight million people around the world received a TB diagnosis.
—Outside, 31 Jan. 2026
Joni was able to attend the couple’s wedding in August of 2024, four months after her diagnosis.
—Joe Smith, New York Times, 31 Jan. 2026
See All Example Sentences for diagnosis
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Angelica Stabile, FOXNews.com, 31 Jan. 2026
Since Millie's diagnosis, her grandparents, Sue and Brian, have been sharing updates about her treatment on a GoFundMe page.
—Brian Anthony Hernandez, PEOPLE, 31 Jan. 2026
Just in 2024 alone, it was reported that over eight million people around the world received a TB diagnosis.
—Outside, 31 Jan. 2026
Joni was able to attend the couple’s wedding in August of 2024, four months after her diagnosis.
—Joe Smith, New York Times, 31 Jan. 2026
See All Example Sentences for diagnosis
Cite this Entry
“Diagnosis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diagnosis. Accessed 7 Feb. 2026.
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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