Yes, so far it is- string theory explains many of the unresolved fundamental problems of our century, such as the opposition between Quantum Mechanics and Einstein's theory of general relativity.
A scientific theory has a different definition from a "general" theory of everyday use. "Regular" theory (according to dictionary.com): contemplation or speculation.guess or conjecture. Scientific...
It is a scientific theory, which makes it different from the way people normally use the word. Scientific study starts out with an idea, (called a hypothesis), that idea is rigorously tested and if...