The Collaborative International Dictionary of English v.0.48:

Loyal \Loy"al\, a. [F. loyal, OF. loial, leial, L. legalis, fr.
   lex, legis, law. See Legal, and cf. Leal.]
   [1913 Webster]
   1. Faithful to law; upholding the lawful authority; faithful
      and true to the lawful government; faithful to the prince
      or sovereign to whom one is subject; unswerving in
      allegiance.
      [1913 Webster]

            Welcome, sir John ! But why come you in arms ?
            To help King Edward in his time of storm,
            As every loyal subject ought to do.   --Shak.
      [1913 Webster]

   2. True to any person or persons to whom one owes fidelity,
      especially as a wife to her husband, lovers to each other,
      and friend to friend; constant; faithful to a cause or a
      principle.
      [1913 Webster]

            Your true and loyal wife.             --Shak.
      [1913 Webster]

            Unhappy both, but loyaltheir loves.   --Dryden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

loyal
    adj 1: steadfast in allegiance or duty; "loyal subjects"; "loyal
           friends stood by him" [ant: disloyal]
    2: inspired by love for your country [syn: patriotic, loyal]
       [ant: disloyal, unpatriotic]
    3: unwavering in devotion to friend or vow or cause; "a firm
       ally"; "loyal supporters"; "the true-hearted soldier...of
       Tippecanoe"- Campaign song for William Henry Harrison; "fast
       friends" [syn: firm, loyal, truehearted, fast(a)]

Moby Thesaurus II by Grady Ward, 1.0:

144 Moby Thesaurus words for "loyal":
   abandoned, acquiescent, active, afire, ardent, assiduous, burning,
   committed, compliant, complying, conforming, conscientious,
   consistent, constant, continuing, dedicated, dependable, devoted,
   devout, diligent, dogged, duteous, dutiful, earnest, enduring,
   faithful, fervent, fervid, fiery, firm, fixed, flaming, flinty,
   hearty, heated, hot, hot-blooded, immovable, immutable,
   impassioned, in earnest, inalterable, indefatigable, indomitable,
   industrious, inflexible, insistent, intense, intent, intent on,
   invincible, lasting, law-abiding, liege, marble-constant,
   meticulous, mindful, never-tiring, obedient, observant, obstinate,
   on fire, passionate, patient, patient as Job, patriotic, perfervid,
   permanent, perseverant, persevering, persistent, persisting,
   pertinacious, plodding, plugging, practicing, preoccupied,
   punctilious, punctual, rapt, red-hot, regardful, relentless,
   reliable, resolute, scrupulous, sedulous, serious, set, settled,
   sincere, single-minded, sleepless, slogging, sot, spirited, stable,
   staunch, steadfast, steady, steely, stubborn, submissive,
   tenacious, tireless, true, true-blue, trusted, trustworthy, trusty,
   unabating, unbending, unconquerable, undaunted, undeflectable,
   undiscouraged, undrooping, unfailing, unfaltering, unflagging,
   unflappable, unflinching, unintermitting, uninterrupted, unnodding,
   unrelaxing, unrelenting, unremitting, unshaken, unsleeping,
   unswerving, untiring, unwavering, unwearied, unwearying, unwinking,
   unyielding, utterly attentive, vehement, warm, weariless,
   white-hot, willing, zealous



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

LOYAL. Legal; according to law; as, loyal matrimony, a lawful marriage;
attached to the existing law.



U.S. Gazetteer Places (2000):

Loyal, WI -- U.S. city in Wisconsin
   Population (2000):    1308
   Housing Units (2000): 576
   Land area (2000):     1.374274 sq. miles (3.559353 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.374274 sq. miles (3.559353 sq. km)
   FIPS code:            46075
   Located within:       Wisconsin (WI), FIPS 55
   Location:             44.737541 N, 90.496551 W
   ZIP Codes (1990):     54446
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Loyal, WI
    Loyal


U.S. Gazetteer Places (2000):

Loyal, OK -- U.S. town in Oklahoma
   Population (2000):    81
   Housing Units (2000): 43
   Land area (2000):     0.078624 sq. miles (0.203634 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.078624 sq. miles (0.203634 sq. km)
   FIPS code:            44300
   Located within:       Oklahoma (OK), FIPS 40
   Location:             35.973684 N, 98.119052 W
   ZIP Codes (1990):     73756
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Loyal, OK
    Loyal