A more thorough explanation:

Definition: Accompanying; resulting in attendant circumstances.

Examples:

• The bride had several attendants who helped her get ready for the wedding.
• The storm caused damage to the house and the attendant circumstances led to a power outage.

The word "attendant" is used to describe something that is accompanying or resulting in something else. In the first example, the attendants are people who are accompanying the bride and helping her. In the second example, the attendant circumstances are the result of the storm, which caused damage to the house and led to a power outage.