The same as it is in 2013.
Wikipedia says, "A superpower is a state with a dominant position in the international system which has the ability toinfluence events and its own interests and project power on a worldwide scale to protect those interests."
DictionaryDOTcom's definition is, "an extremely powerful nation, especially one capable of influencing international events and the acts and policies of less powerful nations. Power greater in scope or magnitude than that which is considered natural or has previously existed."
Merriam-Webster calls a superpower, "an extremely powerful nation; specifically : one of a very few dominant states in an era when the world is divided politically into these states and their satellites, or an international governing body able to enforce its will upon the most powerful states."
By these definitions, the following could be called superpowers:
No, Vietnam is not a superpower.
A superpower in recovery maybe.
Superpower is a fighting type move.
Flareon learns Superpower by Move Tutor.
The Move Tutor can teach Luxray Superpower.
A unique superpower is the ability to tell if someone is telling the truth and if not, what the truth is.
depending on what happens, they could eventually become a superpower.
Superpower - 2008 is rated/received certificates of: USA:PG-13
Some words that rhyme with "superpower" are "flower," "shower," and "tower."
The move Superpower can be tutored to Machamp in Pokemon HeartGold.
Ancient Egypt or Mesoptamia most likely. But they didn't use the term "superpower" then.
The cast of Superpower - 2013 includes: Nicholas Leeman as John