Attendant

At·tend·ant

Attendant

a.
  1. Being present, or in the train; accompanying; in waiting.
    From the attendant flotilla rang notes triumph.
    Cherub and Seraph . . . attendant on their Lord.
  2. Accompanying, connected with, or immediately following, as consequential; consequent; as, intemperance with all its attendant evils.
    The natural melancholy attendant upon his situation added to the gloom of the owner of the mansion.
  3. Depending on, or owing duty or service to; as, the widow attendant to the heir. (Law)

Phrases & Compounds
Attendant keys
the keys or scales most nearly related to, or having most in common with, the principal key; those, namely, of its fifth above, or dominant, its fifth below (fourth above), or subdominant, and its relative minor or major.

Attendant

n.
  1. One who attends or accompanies in any character whatever, as a friend, companion, servant, agent, or suitor.
  2. One who is present and takes part in the proceedings; as, an attendant at a meeting.
  3. That which accompanies; a concomitant.
    [A] sense of fame, the attendant of noble spirits.
  4. One who owes duty or service to, or depends on, another. (Law)