Simultaneity (noun)

1. The state or quality of being simultaneous, happening or existing at the same time.
2. A set of events that occur at the same time.

Origin:

Late latin simultaneousitas, from latin simul 'at the same time' + tangere 'to touch'.

Examples:

1. The simultaneity of the two accidents caused a traffic jam on the highway.
2. The astronomer was interested in the simultaneity of the supernova explosions in different galaxies.
3. The simultaneity of the sun rising and the moon setting was a beautiful sight to see.
4. The simultaneity of the two events was a coincidence that amazed everyone.
5. The simultaneity of the phone call and the doorbell ringing made her jump.