simultaneity.

Occurrence at the same time under the relevant frame of reference.

Use it for

Words that belong together

• simultaneity of events
• perceived simultaneity

On the page

The events’ simultaneity did not show that one caused the other.

Perceived simultaneity depended on the delay between the two signals.

Usage notes

Primary category: academic / formal. Forms: Usually uncountable. 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: requirements and constraints, institutional organization, formal assessment, system properties. Disciplines: academic writing, formal analysis, institutional studies. Commonness: moderately common.