A more thorough explanation:

Definition: Concurrency refers to two different things:

1. Archaic: The quality or fact of having joint right or authority.
2. Criminal procedure: When a defendant is given two or more criminal sentences that have the same duration.

Example: In the past, two kings could have concurrency over the same land, meaning they both had the right to rule over it. In modern times, concurrency is often used in criminal cases where a defendant is given two or more sentences that are meant to be served at the same time.

Explanation: The first example illustrates the archaic definition of concurrency, where two parties have joint right or authority. The second example illustrates the criminal procedure definition of concurrency, where a defendant is given multiple sentences that are meant to be served at the same time.