I think Wikipedia is alright, unless you're more in line with reading Conservapedia. Anyway, there definition of a "scientific theory":

In scientific usage, a theory does not mean an unsubstantiated guess or hunch, as it can in everyday speech. A theory is a logically self-consistent model or framework for describing the behavior of a related set of natural or social phenomena. It originates from or is supported by rigorous observations in the natural world, or by experimental evidence (see scientific method). In this sense, a theory is a systematic and formalized expression of all previous observations, and is predictive, logical, and testable. In principle, scientific theories are always tentative, and subject to corrections, inclusion in a yet wider theory, or succession. Commonly, many more specific hypotheses may be logically bound together by just one or two theories. As a rule for use of the term, theories tend to deal with much broader sets of universals than do hypotheses, which ordinarily deal with much more specific sets of phenomena or specific applications of a theory.
And they're absolutely right. A scientific theory is a theory derived through observation and experimentation. As stated before, evolution is a scientific theory. It can be observed through fossils of past creatures, and experimented with things like DNA (I hate to be so crude, though I don't know the specifics of how evolution is thoroughly tested).

If you still do not think so, you're in zealous denial.