affirmative pleading: any defensive pleading that affirms facts rather than merely denying the facts alleged by the plaintiff
pleading: (law) a statement in legal and logical form stating something on behalf of a party to a legal proceeding
plutonium: a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239