The Collaborative International Dictionary of English v.0.48:

Nonsuit \Non"suit`\, n. (Law)
   A neglect or failure by the plaintiff to follow up his suit;
   a stopping of the suit; a renunciation or withdrawal of the
   cause by the plaintiff, either because he is satisfied that
   he can not support it, or upon the judge's expressing his
   opinion. A compulsory nonsuit is a nonsuit ordered by the
   court on the ground that the plaintiff on his own showing has
   not made out his case.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Nonsuit \Non"suit`\, v. t. [imp. & p. p. Nonsuited; p. pr. &
   vb. n. Nonsuiting.] (Law)
   To determine, adjudge, or record (a plaintiff) as having
   dropped his suit, upon his withdrawal or failure to follow it
   up. "When two are joined in a writ, and one is nonsuited."
   --Z. Swift.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Nonsuit \Non"suit`\, a.
   Nonsuited. --D. A. Tyng.
   [1913 Webster]