What is Affirmative Pregnant?

Legal Definition
Pleading. An affirmative allegation, implying some negative, in favor of the adverse party, for example, if to an action of assumpsit, which is barred by the act of limitations of six years, the defendant pleads that be did not undertake &c. within ten years; a replication that he did undertake, &c. within ten years, would be an affirmative pregnant; since it would impliedly admit that the defendant had not promised within six years. As no proper issue could be tendered upon such plea the plaintiff should, for that reason, demur to it. Gould, PI. c. 6 29, 37; Steph. PI. 381; Lawes, Civ. PI. 113; Bac. Ab. Pleas, N 6.
-- Bouviers Law Dictionary
Legal Definition
In pleading. An affirmative allegation implying some negative in favor of the adverse party. Fields v. State, 134 Ind. 46, 32 N. E. 780.
-- Black's Law Dictionary
Legal Definition
An affirmative allegation implying a negative in favor of the adverse party. See 134 Ind. 46, 32 N. E. 780.
-- Ballentine's Law Dictionary