co-occur

verb

co-oc·​cur ˌkō-ə-ˈkər 

co-occurred; co-occurring

intransitive verb

: to occur at the same time or in the same place

symptoms that often co-occur

co-occurring species

… certain words co-occur or collocate regularly with certain other words.

—Morton Benson

co-occurrence

ˌkō-ə-ˈkər-ən(t)s 

noun

plural co-occurrences

co-occurrence of the reactions

co-occurrence of two diseases

Synonyms of co-occur

• accompany
• coincide
• coexist

Examples of co-occur in a Sentence

the chronic depression that so often co-occurs with drug abuse

Recent Examples on the Web

In the morning session, other members brought up proposals aimed at decreasing the risk of autistic people wandering out of safe areas and risking injury and increasing recognition about the role that co-occurring illnesses play with autistic people. — O. Rose Broderick, STAT, 28 Apr. 2026

In the world of language, there are certain trends in terms of words that frequently co-occur in phrases or sentences together, some-thing called collocation. — Literary Hub, 21 Apr. 2026

Diseases that tend to co-occur often present themselves consecutively. — Benjamin P. Brown, The Conversation, 7 Apr. 2026

Though it should be noted that these programs do not directly address co-occurring mental health issues and could unintentionally reinforce unhelpful behaviors. — Gwilym Roddick, The Orlando Sentinel, 8 Mar. 2026

Word History

First Known Use

1957, in the meaning defined above

Rhymes for co-occur

• amateur
• connoisseur
• kieselguhr
• monseigneur
• procureur
• retransfer
• saboteur
• silencer
• voyageur
• birr
• blur
• bur