Collins COBUILD Advanced Learner's English Dictionary - superpower

(superpowers) A superpower is a very powerful and influential country, usually one that is rich and has nuclear weapons. The United States could claim to be both a military and an economic superpower. N-COUNT SUPERSEDE (supersedes, superseding, superseded) If something is superseded by something newer, it is replaced because it has become old-fashioned or unacceptable. Hand tools are relics of the past that have now been superseded by the machine. VERB: usu passive, be V-ed, also V n