reconvention

from The Century Dictionary.

• noun In law, an action by a defendant against a plaintiff in a previous or pending action; a cross-bill or counter-claim.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Civil Law) A cross demand; an action brought by the defendant against the plaintiff before the same judge.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun law, civil law An action brought by the defendant against the plaintiff before the same judge.