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 mom of three has made very few public appearances since her stiff-person syndrome diagnosis — she was diagnosed with the rare autoimmune and neurological disorder in August 2022 — but has previously stepped out to enjoy live music.
—
Bailey Richards, PEOPLE, 5 Oct. 2025
Prior to the cancer diagnosis, the Pro Football Hall of Famer struggled with issues to his left foot.
—Ryan Gaydos, FOXNews.com, 5 Oct. 2025
Combs’s legal team, including five attorneys who addressed the court, emphasized his mental health struggles, citing diagnoses of PTSD, depression, and substance abuse.
—Hannah Parry, MSNBC Newsweek, 3 Oct. 2025
For each shirt purchased, 100% of the proceeds will be donated to the Baptist Health Foundation directly supporting Baptist’s mission to provide personal care to each patient from diagnosis to survivorship and beyond.
—Michelle Kaufman, Miami Herald, 3 Oct. 2025
See All Example Sentences for diagnosis
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Bailey Richards, PEOPLE, 5 Oct. 2025
Prior to the cancer diagnosis, the Pro Football Hall of Famer struggled with issues to his left foot.
—Ryan Gaydos, FOXNews.com, 5 Oct. 2025
Combs’s legal team, including five attorneys who addressed the court, emphasized his mental health struggles, citing diagnoses of PTSD, depression, and substance abuse.
—Hannah Parry, MSNBC Newsweek, 3 Oct. 2025
For each shirt purchased, 100% of the proceeds will be donated to the Baptist Health Foundation directly supporting Baptist’s mission to provide personal care to each patient from diagnosis to survivorship and beyond.
—Michelle Kaufman, Miami Herald, 3 Oct. 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 6 Oct. 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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