co-occurrence.

The appearance or presence of two or more things at the same time or in the same context.

Use it for

Words that belong together

• the co-occurrence of symptoms
• frequent co-occurrence

On the page

The co-occurrence of the two symptoms suggested a connection, not proof of a shared cause.

Usage notes

Primary category: academic / formal. Forms: Countable or uncountable by context; countable singular co-occurrence; plural co-occurrences. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: analysis, interpretation. Commonness: moderately common.