When things happen at the same time, they are synchronisations.
Synchronisations are usually good because they mean things are working together.
Examples:
The dancers move in perfect synchronisations.
The synchronisations of the traffic lights help cars move smoothly.
In the play, the actors need to have perfect synchronisations.
The ducks swim in funny synchronisations.
The synchronisations of the clocks in the house are very important.
The music and the fireworks have perfect synchronisations.