The Collaborative International Dictionary of English v.0.48:

Arret \Ar*r[^e]t\, n. [F. See Arrest, n.] (F. Law)
      (a) A judgment, decision, or decree of a court or high
          tribunal; also, a decree of a sovereign.
      (b) An arrest; a legal seizure.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Arret \Ar*ret"\, v. t.
   Same as Aret. [Obs.] --Spenser.
   [1913 Webster]

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

ARRET, French law. An arret is a judgment, sentence, or decree of, a court
of competent jurisdiction. Saisie-arret is an attachment of property in the
hands of a third person. Code of Pract. of Lo. art. 209.