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