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noun

comorbidity

/ˌkoʊmɔrˈbɪdəti/  ·  say it: koh·mor·BID·uh·tee

an additional disease occurring alongside a primary one

In Medicine & Health

In more detail

1. (noun) the presence of two or more diseases or medical conditions occurring together in the same person at the same time

2. (noun) in research, the co-occurrence of different conditions or disorders in the same individual or population

Examples

How to use comorbidity

Comorbidity is used in medical and epidemiological contexts to describe when a person has multiple diagnosed conditions at the same time. It is a technical term used in clinical practice, research, and health policy to understand disease patterns and patient outcomes. The term is more precise and academic than everyday language like 'having multiple illnesses.'

Register: technical

Common phrases

Synonyms

co-occurrence · concurrent illness · simultaneous disease · coexisting condition

Word family

comorbid (adjective) · comorbidities (plural noun)

A common mistake

Learners sometimes confuse comorbidity with complications, which are conditions that develop as a result of another disease, whereas comorbidities are conditions that exist independently and simultaneously.

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