The Collaborative International Dictionary of English v.0.48:

Miscontinuance \Mis`con*tin"u*ance\, n. (Law)
   Discontinuance; also, continuance by undue process.
   [1913 Webster]

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

MISCONTINUANCE, practice. By this term is understood a continuance of a suit
by undue process. Its effect is the same as a discontinuance. (q.v.) 2
Hawk. 299; Kitch. 231; Jenk. Cent. 57.