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

(game theory) Informally, a game formalized using a function (called the characteristic function) that assigns to each coalition of players a real number representing the payoff that the coalition can gain if it is formed, without specifying how the outcome is divided among the participants of the coalition; upon the execution of the game, each player can be a member of at most one coalition.

Accipiter cooperii, a medium-sized hawk found from Canada to northern Mexico.

plural of Cooper's hawk

plural of wine cooper

A river in Australia, flowing into Lake Eyre basin.

A plant, the cattail.

plural of Cooper pair

A form of federalism in which national, state, and local governments interact cooperatively and collectively to solve common problems, rather than making separate but similar policies.

plural of Cooper test