simultaneousness

Happening at once

The quality or state of occurring at the same time.

Simultaneousness is the noun form of simultaneous, though simultaneity is more common in formal and technical contexts: The simultaneousness of the two events suggested coordination rather than coincidence.

synchrony

concurrence

State of agreeing

overlap · unison · coordination · alignment · timing · phasing · synergy · harmony · interplay · meshing

real-time

live

To exist or dwell

broadcast · immediate · concurrent · interactive · up-to-the-minute · split-second

coincidence

serendipity

Accidental fortunate discovery

fluke · fortuity · confluence · convergence · intersection · juncture · alignment · co-occurrence · correspondence · concomitance

Opposites
temporal arrangement

simultaneousnesssuccession

Following in order

consecutiveness · seriality · successiveness · chronological order · asynchrony

Family

simulate, simulation, simultaneous, simultaneously, simulacrum, simultaneity, simulator

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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G