(physics) A pair of electrons (or other fermions), of opposite spin, whose theorised behaviour is the basis of the BCS theory of superconductivity.

A co-opting: a commandeering, appropriation, or taking over. / A co-opting: an absorption or assimilation.

Gold brocade.

Having two tongues; double-tongued. / (by extension) Deceitful; lying; two-faced. / (rare) Possessing the ability to speak two languages; synonym of bilingual.