What is Anarchy?

Legal Definition
Anarchy is the condition of a society, entity, group of people, or a single person that rejects hierarchy. The term originally meant leaderlessness, but in 1840, Pierre-Joseph Proudhon adopted the term in his treatise What Is Property? to refer to a new political philosophy, anarchism, which advocates stateless societies based on voluntary associations. In practical terms, anarchy can refer to the curtailment or abolition of traditional forms of government.
-- Wikipedia
Legal Definition
The destruction of government; lawlessness; the absence of all political government; by extension, confusion in government. See Spies v. People, 122 III. 1, 253, 12 N. E. 865, 3 Am. St Rep. 320; Lewis v. Daily News Co., 81 Md. 466, 32 Atl. 246, 29 L. R. A. 59 ; People v. Most, 36 Misc. Rep. 139, 73 N. Y. Supp. 220; Von Gerichten v. Seitz, 94 App. Div. 130, 87 N. Y. Supp. 968.
-- Black's Law Dictionary
Legal Definition
The absence of all political government; by extension, it signifies confusion in government.
-- Bouviers Law Dictionary
Legal Definition
The absence of government.
-- Ballentine's Law Dictionary