attendant

Short definition from Wiktionary

Noun

1. 1
   One who attends; one who works with or watches over someone or something.
2. 2
   A servant or valet.
3. 3
   A visitor or caller; one who attends (is present at or regularly goes to) some event or place.
4. 4
   That which accompanies or follows.
5. 5
   One who owes a duty or service to another.

Adjective

1. 1
   Going with; associated; concomitant.
2. 2
   Depending on, or owing duty or service to.