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
Smith has been by the hip-hop legend's side for much of his career, and LL Cool J has supported her through various ups and downs, including the launch of her own jewelry line and her bone cancer diagnosis.
—
Vandana Pawa, PEOPLE, 7 Sep. 2025
Knowing your cancer’s stage can give you insight into the seriousness of your cancer diagnosis and your prognosis.
—Sherri Gordon, Health, 7 Sep. 2025
Right now, the average age of diagnosis is around 67 years, which is roughly the age at which the now 69-year-old Borg was diagnosed.
—Bruce Y. Lee, Forbes.com, 6 Sep. 2025
The condition's most severe symptoms are sensitivities to spices, salt, and sweets, which means there's no reason to worry about a geographic tongue diagnosis.
—Wesley Stenzel, Entertainment Weekly, 6 Sep. 2025
See All Example Sentences for diagnosis
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Vandana Pawa, PEOPLE, 7 Sep. 2025
Knowing your cancer’s stage can give you insight into the seriousness of your cancer diagnosis and your prognosis.
—Sherri Gordon, Health, 7 Sep. 2025
Right now, the average age of diagnosis is around 67 years, which is roughly the age at which the now 69-year-old Borg was diagnosed.
—Bruce Y. Lee, Forbes.com, 6 Sep. 2025
The condition's most severe symptoms are sensitivities to spices, salt, and sweets, which means there's no reason to worry about a geographic tongue diagnosis.
—Wesley Stenzel, Entertainment Weekly, 6 Sep. 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 9 Sep. 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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