The Collaborative International Dictionary
Issuable plea
Issuable \Is"su*a*ble\, a. [From Issue.]
Leading to, producing, or relating to, an issue; capable of being made an issue at law.
--Burrill.-
Lawful or suitable to be issued; as, a writ issuable on these grounds.
Issuable plea (Law), a plea to the merits, on which the adverse party may take issue and proceed to trial.