The Collaborative International Dictionary of English v.0.48:

Attendant \At*tend"ant\, a. [F. attendant, p. pr. of attendre.
   See Attend, v. t.]
   1. Being present, or in the train; accompanying; in waiting.
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            From the attendant flotilla rang notes triumph.
                                                  --Sir W.
                                                  Scott.
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            Cherub and Seraph . . . attendant on their Lord.
                                                  --Milton.
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   2. Accompanying, connected with, or immediately following, as
      consequential; consequent; as, intemperance with all its
      attendant evils.
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            The natural melancholy attendant upon his situation
            added to the gloom of the owner of the mansion.
                                                  --Sir W.
                                                  Scott.
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   3. (Law) Depending on, or owing duty or service to; as, the
      widow attendant to the heir. --Cowell.
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   Attendant keys (Mus.), 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.
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The Collaborative International Dictionary of English v.0.48:

Attendant \At*tend"ant\, n.
   1. One who attends or accompanies in any character whatever,
      as a friend, companion, servant, agent, or suitor. "A
      train of attendants." --Hallam.
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   2. One who is present and takes part in the proceedings; as,
      an attendant at a meeting.
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   3. That which accompanies; a concomitant.
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            [A] sense of fame, the attendant of noble spirits.
                                                  --Pope.
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   4. (Law) One who owes duty or service to, or depends on,
      another. --Cowell.
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WordNet (r) 3.0 (2006):

attendant
    adj 1: being present (at meeting or event etc.) "attendant
           members of the congreation"
    2: following or accompanying as a consequence; "an excessive
       growth of bureaucracy, with attendant problems"; "snags
       incidental to the changeover in management"; "attendant
       circumstances"; "the period of tension and consequent need
       for military preparedness"; "the ensuant response to his
       appeal"; "the resultant savings were considerable" [syn:
       attendant, consequent, accompanying, concomitant,
       incidental, ensuant, resultant, sequent]
    n 1: someone who waits on or tends to or attends to the needs of
         another [syn: attendant, attender, tender]
    2: a person who is present and participates in a meeting; "he
       was a regular attender at department meetings"; "the
       gathering satisfied both organizers and attendees" [syn:
       attendant, attender, attendee, meeter]
    3: an event or situation that happens at the same time as or in
       connection with another [syn: accompaniment, concomitant,
       attendant, co-occurrence]

Moby Thesaurus II by Grady Ward, 1.0:

215 Moby Thesaurus words for "attendant":
   Ganymede, Hebe, X-ray technician, accessible, accessory,
   accompanier, accompanist, accompanying, accompanyist, acolyte,
   adherent, adjunct, adjutant, after, agent, aid, aide, aide-de-camp,
   aider, air warden, airline hostess, airline stewardess, ancilla,
   ancillary, anesthetist, appendage, assistant, associated, at hand,
   attendance, attending, auxiliary, available, batman, bellboy,
   bellhop, bellman, best man, body of retainers, bootblack, boots,
   buff, cabin boy, caddie, cadet, caretaker, castellan,
   cavaliere servente, chaperon, chaperone, chore boy, coadjutant,
   coadjutor, coadjutress, coadjutrix, cohort, coincident, collateral,
   comate, combined, companion, companion piece, concomitant,
   concurrent, conjoint, consecutive, consequent, conservator,
   consort, copyboy, corollary, correlative, cortege, coupled, court,
   courtier, cupbearer, curator, custodian, dangler, dependent,
   depending, deputy, dietitian, disciple, dresser, ensuing,
   entourage, errand boy, errand girl, escort, executive officer, fan,
   fellow, flunky, follower, following, footboy, forest ranger,
   game warden, gamekeeper, gofer, governor, guardian, guardian angel,
   hanger-on, help, helper, helping, helpmate, helpmeet, henchman,
   homme de cour, hospital administrator, hostess, immanent,
   immediate, in view, incident, indwelling, inherent, janitor,
   joined, joint, junior, keeper, laboratory technician, lackey,
   later, lieutenant, lifeguard, lifesaver, lineal, mate, menial,
   ministering, mutual, next friend, office boy, office girl,
   on board, on deck, on hand, orderly, page, paired, parallel,
   paranymph, paraprofessional, parasite, partisan, partner,
   physical therapist, physiotherapist, posterior, present,
   prochein ami, public, puisne, pursuer, pursuivant, radiographer,
   radiotherapist, ranger, related, resultant, resulting, retinue,
   rout, satellite, second, sectary, sequent, servant, servile,
   serving, servitorial, shadow, shepherd, sideman, simultaneous,
   slave, squire, steward, stewardess, stooge, striker, subordinate,
   subsequent, succeeding, successive, successor, suite, supporter,
   supporting actor, supporting instrumentalist, tagtail, tail,
   tender, train, trainbearer, twin, underling, usher, usherette,
   votary, waiting, ward heeler, warden, warder, within call,
   within reach, within sight, yeoman, younger



Bouvier's Law Dictionary, Revised 6th Ed (1856):

ATTENDANT. One who owes a duty or service to another, or in some sort
depends upon him. Termes de la Ley, h.t. As to attendant terms, see Powell
on Morts. Index, tit. Attendant term; Park on Dower, c. 1 7.