A plea to some matter incidental to the main object of the suit, and out of the direct line of pleadings.  In the more ancient system of pleading, counter-plea was applied to what was, in effect, a replication to aid prayer, that is, where a tenant for life or other limited interest in land, having an action brought against him in respect to the title to such land, prayed in aid of the lord or reversioner for his better defense, that which the defendant alleged against either request was called a “counter-plea.”

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