co-occur
Americanverb (used without object)
Other Word Forms
Etymology
Origin of co-occur
First recorded in 1950–55
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
Other types could include conditions that can co-occur with autism, such as ADHD, depression and epilepsy.
From BBC ● Aug. 21, 2026
Previous studies have demonstrated that wildfires and extreme heat co-occur with great frequency, and that people’s physiological responses to the hazards are related, he said.
From Los Angeles Times ● Feb. 3, 2024
Red deer density is only reduced when wolves, lynx and bears co-occur at the same site.
From Science Daily ● Jan. 10, 2024
If you look at the way that choice occurs in common speech, both within the United States and in Ireland, it tends to co-occur with consumer things.
From Slate ● May 16, 2022
These so-called comorbidities—meaning the conditions co-occur with Internet addiction—include “attention-deficit hyperactivity, mood, anxiety and personality disorders.”
From "A Deadly Wandering: A Mystery, a Landmark Investigation, and the Astonishing Science of Attention in the Digital Age" by Matt Richtel
In every place, copies of the Borg co-occurred with DNA linked to a methane-oxidizing archaeon called Methanoperedens.
From Science Magazine ● Jul. 15, 2021
In the early 1980s, for instance, it was clinicians’ observations that pneumocystis pneumonia co-occurred with Kaposi’s sarcoma in men in San Francisco that led to the identification of HIV/AIDS as the common risk factor19.
From Nature ● Mar. 23, 2020
What happened in 2015 is that very low precipitation co-occurred with record high temperatures.
From National Geographic ● Sep. 14, 2015
A 2021 study of more than 42,000 caregivers of children ages 3 to 17 found that 78% of autistic children had at least one co-occurring psychiatric condition, compared with 14% of non-autistic kids.
From Los Angeles Times ● Nov. 20, 2025
Among the most common co-occurring illnesses were chronic fatigue syndrome and mast cell activation syndrome, or MCAS, a condition where patients experience intense episodes of diarrhea, hives, vomiting, and, in many cases, life-threatening anaphylaxis attacks.
From Slate ● Sep. 15, 2025
Interestingly, recent research suggests this can carry over to co-occurring content.
From Salon ● Oct. 21, 2023
Nearly 70% of people with co-occurring symptoms reported limitations at work, more than 55% reported difficulty taking part in social endeavors and almost 44% were more likely to have difficulty doing errands alone.
From Science Daily ● Sep. 22, 2023
As an expert on mental health courts, I argue for expanding treatment courts, especially co-occurring courts that are designed to address both substance abuse and mental illness.
From Seattle Times ● Aug. 2, 2023
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
