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:
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 sleep spindles often co-occur with slow-wave sleep, a particular frequency of slowly oscillating EEG activity.
From Washington Post ● Feb. 5, 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
Symptoms cluster around difficulties in communication, social interaction and sensory processing, and the condition can manifest in many different ways based on co-occurring disabilities and other factors.
From Los Angeles Times ● Sep. 22, 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
Duravsula added that "neurodivergent people who do not have co-occurring antagonistic personality styles will often be quite contrite and apologetic if they are informed that their conduct or words may have hurt someone."
From Salon ● Nov. 29, 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
Some of her clients are elderly and have co-occurring conditions like dementia.
From Seattle Times ● Aug. 24, 2022
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.
