One who attends; one who works with or watches over something.

"Give your keys to the parking attendants and they will park your car for you."

A servant or valet.

A visitor or caller.

That which accompanies or follows.

One who owes a duty or service to another.

Going with; associated; concomitant.

"They promoted him to supervisor, with all the attendant responsibilities and privileges."

Depending on, or owing duty or service to.

"the widow attendant to the heir"