Affirmative plea
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
One which sets up a single fact, not appearing in the bill, or sets np a number of circumstances all tending to establish a single fact, which fact, if existing, destroys the complainant's case.
Potts v. Potts (N. J. Ch.) 42 Atl. 1055.