The Collaborative International Dictionary of English v.0.48:

Obey \O*bey"\, v. t. [imp. & p. p. Obeyed; p. pr. & vb. n.
   Obeying.] [OE. obeyen, F. ob['e]ir, fr. L. obedire,
   oboedire; ob (see Ob-) + audire to hear. See Audible, and
   cf. Obeisance.]
   1. To give ear to; to execute the commands of; to yield
      submission to; to comply with the orders of.
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            Children, obey your parents in the Lord. --Eph. vi.
                                                  1.
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            Was she the God, that her thou didst obey? --Milton.
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   2. To submit to the authority of; to be ruled by.
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            My will obeyed his will.              --Chaucer.
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            Afric and India shall his power obey. --Dryden.
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   3. To yield to the impulse, power, or operation of; as, a
      ship obeys her helm.
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The Collaborative International Dictionary of English v.0.48:

Obey \O*bey"\, v. i.
   To give obedience.
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         Will he obey when one commands?          --Tennyson.
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   Note: By some old writers obey was used, as in the French
         idiom, with the preposition to.
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               His servants ye are, to whom ye obey. --Rom. vi.
                                                  16.
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               He commanded the trumpets to sound: to which the
               two brave knights obeying, they performed their
               courses.                           --Sir. P.
                                                  Sidney.
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WordNet (r) 3.0 (2006):

obey
    v 1: be obedient to [ant: disobey]

Moby Thesaurus II by Grady Ward, 1.0:

80 Moby Thesaurus words for "obey":
   abide by, accede, accept, acquiesce, acquiesce in, act, adhere to,
   agree, agree to, assent, attend to orders, be agreeable, bend to,
   bow, bow to, carry out, comply, comply with, condone, conform,
   conform to, conform with, consent, consent to, countenance, defer,
   defer to, discharge, do, effect, execute, face the music, follow,
   follow the book, fulfill, give way to, go along with,
   grin and abide, harken to, heed, keep, knock under, knuckle down,
   knuckle under, knuckle under to, let go by, let pass, listen to,
   live with it, mark, meet, mind, not resist, obey the rules,
   observe, overlook, perform, regard, relent, resign, respect,
   rise above, satisfy, serve, shrug, shrug it off, stay in line,
   submit, submit to, succumb, succumb to, swallow it,
   swallow the pill, take, take it, take orders, toe the line,
   truckle to, yield, yield to