The Collaborative International Dictionary of English v.0.48:

Anarchy \An"arch*y\, n. [Gr. ?: cf. F. anarchie. See Anarch.]
   1. Absence of government; the state of society where there is
      no law or supreme power; a state of lawlessness; political
      confusion.
      [1913 Webster]

            Spread anarchy and terror all around. --Cowper.
      [1913 Webster]

   2. Hence, confusion or disorder, in general.
      [1913 Webster]

            There being then . . . an anarchy, as I may term it,
            in authors and their re?koning of years. --Fuller.
      [1913 Webster]

WordNet (r) 3.0 (2006):

anarchy
    n 1: a state of lawlessness and disorder (usually resulting from
         a failure of government) [syn: anarchy, lawlessness]

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "anarchy":
   aloofness, amorphia, amorphism, amorphousness, anarchism,
   anarcho-syndicalism, anomie, antinomianism, blurriness, chaos,
   confusion, criminal syndicalism, criminalism, criminality,
   diffusion, discontinuity, discreteness, disjunction, dislocation,
   disorder, disorderliness, disorganization, dispersal, dispersion,
   disruption, dissolution, distemper, entropy,
   fabulous formless darkness, formlessness, foul-up, fuzziness,
   hassle, haziness, illegality, illicit business, illicitness,
   impermissibility, incoherence, inconsistency, indecisiveness,
   indefiniteness, indeterminateness, lawlessness, legal flaw,
   license, lynch law, messiness, misrule, mistiness, mix-up, mob law,
   mob rule, mobocracy, morass, muddle, nihilism, nonadhesion,
   noncohesion, obscurity, ochlocracy, orderlessness, outlawry,
   primal chaos, rebellion, reign of terror, revolution, riot,
   scattering, screw-up, separateness, shapelessness, snafu,
   syndicalism, technical flaw, tohubohu, turmoil, unadherence,
   unadhesiveness, unclearness, unlawfulness, unruliness, untenacity,
   vagueness, wrongfulness



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

ANARCHY. The absence of all political government; by extension, it signifies
confusion in government.