Source : Webster's Revised Unabridged Dictionary (1913)

Unicameral \U`ni*cam"e*ral\, a. [Uni- + L. camera vault.]
   Having, or consisting of, a single chamber; -- said of a
   legislative assembly. [R.] --F. Lieber.

Source : WordNet®

unicameral
     adj : composed of one legislative body [ant: {bicameral}]