Definition of the volt

Voltage = (energy/time) per (charge/time)

Conceptually the volt is the energy transferred per coulomb of charge. However the volt is in fact defined via the formula power = current x voltage:

One volt is the potential difference across a conductor when a current of one ampere dissipates one watt of power.

Animation showing how to connect a voltmeter in parallel.

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So instead of energy we have power, which is just energy per second.

And instead of charge we have current, which is just charge flowing past a point per second.

So the official definition is just our conceptual definition but per second. In other words it's

The energy-transferred-per-second per coulomb-of-charge-passing-each-second.

I'm sure that's a lot clearer...