Wikipedia has a rather good explanation of "scientific theory". Please, before you post a comment saying "evolution is JUST a theory", do yourself and everyone else a favor and read below.
A scientific theory is "a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have beenrepeatedly confirmed through observation and experiment."Scientists create scientific theories from hypotheses that have been corroborated through the scientific method, then gather evidence to test their accuracy. As with all forms of scientific knowledge, scientific theories are inductive in nature and do not make apodictic propositions; instead, they aim for predictive and explanatory force.
The strength of a scientific theory is related to the diversity of phenomena it can explain, which is measured by its ability to make falsifiable predictions with respect to those phenomena. Theories are improved as more evidence is gathered, so that accuracy in prediction improves over time. Scientists use theories as a foundation to gain further scientific knowledge, as well as to accomplish goals such as inventing technology or curing disease.
Scientific theories are the most reliable, rigorous, and comprehensive form of scientific knowledge. This is significantly different from the word "theory" in common usage, which implies that something is unproven or speculative.
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