TRANSACTION - A particular kind of external event involving the transfer of something of value concerning two or more entities.
A transaction is an external event that has more than one entity.
A transaction is an external event that has just one entity.
A boy plays with the arcade machine.
The cat sat in the window.
The woman is walling.
The beasts were very calm.
Someone is in a stable with a horse.
The government reduces the number of allowances over time.