资料来源 : pyDict

同时发生,同时

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Simultaneity \Si`mul*ta*ne"i*ty\, n.
   The quality or state of being simultaneous; simultaneousness.

资料来源 : WordNet®

simultaneity
     n : happening or existing or done at the same time [syn: {simultaneousness}]