The Collaborative International Dictionary of English v.0.48:
Declaratory \De*clar"a*to*ry\, a. [Cf. F. d['e]claratoire.] Making declaration, explanation, or exhibition; making clear or manifest; affirmative; expressive; as, a clause declaratory of the will of the legislature. [1913 Webster] Declaratory act (Law), an act or statute which sets forth more clearly, and declares what is, the existing law. [1913 Webster]