A more thorough explanation:

Ad seriatim

Ad seriatim is a Latin phrase that means "one after another" or "in a series." It is often used in legal contexts to describe a process where multiple issues are addressed in a specific order.

When a judge delivers an opinion on a case, they may do so ad seriatim, addressing each issue one by one in a specific order. Similarly, a court may deal with multiple legal issues ad seriatim, meaning they address each issue in a specific order.

For example, if a court is dealing with a case that involves both criminal charges and civil claims, they may address the criminal charges first and then move on to the civil claims ad seriatim.

The examples illustrate how ad seriatim is used to describe a process where multiple issues are addressed in a specific order. In both cases, the judge or court is addressing each issue one by one, in a specific order, rather than addressing them all at once. This can help ensure that each issue is given the appropriate attention and consideration.