attendant

noun

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

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

2. A servant or valet.
3. (archaic)A visitor or caller; one who attends (is present at or regularly goes to) some event or place.

   “The most remarkable of all the attendants of the exhibition at the grove near Rockville, was the grace and loveliness of the young beauties, who, mingling with the crowd of farmers, were all intent and gazing upon the stock and other agricultural products, unconscious that they were themselves ‘the observed of all observers;’ […]”

   “In early life our subject was an attendant of Public School No. 17 in Brooklyn, and after fitting himself for business he engaged in various occupations in New York city up to the year 1889, at which time he removed to the town of Hempstead, and during the succeeding six years followed fanning as an occupation.”

4. That which accompanies or follows.
5. One who owes a duty or service to another.

adj

1. Going with; associated; concomitant.

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

   “The natural melancholy attendant upon his situation added to the gloom of the owner of the mansion.”

   “About 200 guests were invited and entertained to lunch in the so-called booking hall at Waterloo; the contractors, Spiers & Pond Limited, were much praised for organising the repast, with attendant cloak room facilities, so well in such unfavourable surroundings.”

   “Both Carey Schofield's Jagger and Chet Flippo's On the Road with the Rolling Stones: Twenty Years of Lipstick, Handcuffs and Chemicals are glib, gonzo journalism about the world's favorite musical sex purveyors. Both avoid much mention of the homosexuality which has always been attendant to the group.”

   “The applicants […] seek to argue that because of the dire prognosis attaching to their medical condition, they should have been allowed to assume the risks attendant on a potentially life‑saving experimental product.”

2. Depending on, or owing duty or service to.

   “the widow attendant to the heir”

   “The tenant in dower[…]shall be attendant unto them by the rate and portion of the rent.”