simultaneity
Happening at once
Simultaneity is the condition of happening at the same time.
The word appears most often in technical contexts—physics, music, philosophy—where precise timing matters: The simultaneity of the two events depends on the observer's frame of reference.
In everyday speech, people usually say "at the same time" rather than reach for simultaneity.
State of agreeing
- contemporaneityExisting in same period
- concomitanceSimultaneous existence or occurrence
- co-occurrenceJoint presence in context
- parallelismMatching structural elements
overlap · togetherness · jointness · mutuality · interdependence · interplay · confluence · convergence
Organized cooperative movement
- timingArt of choosing moments
- synchronyTemporal coordination
- orchestrationScoring for instrumental ensemble
- alignmentCorrect relative positioning
calibration · attunement · meshing · interlocking · sequencing · harmonization · tuning · correlation
Meaningful but uncaused connection
- serendipityAccidental fortunate discovery
- happenstanceUnplanned circumstance
- chanceLikelihood of occurrence
- fortuityAccidental lucky occurrence
fluke · providence · kismet · fate · convergence · alignment · conjunction · concurrence
Harmony between parties
- unityWholeness through cohesion
- consonanceHarmonious sound combination
- resonanceAmplified oscillation at natural frequency
- rapportHarmonious mutual connection
cohesion · balance · concordance · synergy · attunement · compatibility · consensus · convergence
How observers differ
- spacetimeMerged dimensional framework
- time dilationClocks slow at speed
- reference frameBasis for measuring position
- observerOne who perceives events
concurrence
State of agreeing
- contemporaneityExisting in same period
- concomitanceSimultaneous existence or occurrence
- co-occurrenceJoint presence in context
parallelism · overlap · togetherness · jointness · mutuality · interdependence · interplay · confluence · convergence · intersection
coordination
Organized cooperative movement
- timingArt of choosing moments
- synchronyTemporal coordination
- orchestrationScoring for instrumental ensemble
alignment · calibration · attunement · meshing · interlocking · sequencing · harmonization · tuning · correlation · matching
synchronicity
Meaningful but uncaused connection
- serendipityAccidental fortunate discovery
- happenstanceUnplanned circumstance
- chanceLikelihood of occurrence
fortuity · fluke · providence · kismet · fate · convergence · alignment · conjunction · concurrence · fortuitousness
accord
Harmony between parties
- unityWholeness through cohesion
- consonanceHarmonious sound combination
- resonanceAmplified oscillation at natural frequency
rapport · cohesion · balance · concordance · synergy · attunement · compatibility · consensus · convergence · blending
relativity
How observers differ
- spacetimeMerged dimensional framework
- time dilationClocks slow at speed
- reference frameBasis for measuring position
- timesecond, minute, hour, day, seconds
- time wordsminute, hour, day, now, soon
- sign languageAmerican Sign Language, British Sign Language, fingerspelling, ASL, handshape
- CubismPablo Picasso, cubism, Georges Braque, Picasso, Braque
- spacetime conceptsspacetime, dimension, relativity, continuum, duration
- temporalitytime, duration, past, present, future
simultaneitysuccession
Following in order
consecutiveness · seriality · one after another · chronological order · linearity
simultaneityasynchrony
Lack of temporal coordination
asynchronicity · desynchronization · out of sync · misalignment · lag
simulate, simulation, simultaneous, simultaneously, simulacrum, simulator, simultaneousness