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In common parlance, a theory is a hunch or guess about something (e.g., "I have a theory that my teacher is an alien"). In science, however, a theory is an explanation of a set of observations that has been tested and found to be well-supported by evidence (e.g., "the theory of relativity"). The common usage of the word theory is closer in meaning to hypothesis in science: a plausible (or possible) explanation.

The distinction between a theory and a hypothesis (or even a guess) is an important one, and ignoring it leads to the kind of equivocation in apologetics exemplified by the claim that "evolution is only a theory".

As defined by Kevin Padian in his testimony in the Kitzmiller v. Dover Area School District trial:

"A theory, in science, [is] a very large body of information that's withstood a lot of testing. It probably consists of a number of different hypotheses, many different lines of evidence. And it's something that is very difficult to slay with an ugly fact, as Huxley once put it, because it's just a complex body of work that's been worked on through time."

Kitzmiller v. Dover trial transcript, day 9, a.m. session

v · d Science
v · d General science
Scientific method   Scientific theory · Hypothesis · Evidence · Examining claims · Skepticism
Scientific Disciplines   Physics · Biology · Chemistry · Psychology · Medical Science · Mathematics
History of science   Library of Alexandria · Aristotle · Dark ages · Renaissance · The enlightenment · Heliocentrism · Newtonian physics · Darwinian evolution · Mendelian genetics · Relativity Theory · Quantum mechanics · Space exploration · Computer sciences · String theory
Champions of reason   Carl Sagan · Karl Kruszelnicki · Julius Sumner Miller · John Allan Paulos · James Randi
v · d Biology
Evolution   Overview of genetics · Genetic mutation · Hereditary change · Natural selection · Adaptation
Abiogenesis   Possible theories of abiogenesis · Building blocks of life · The Urey-Miller experiment
Evolutionary straw men   Life just exploded from nothing · So you think we came from monkeys · How did the first dog find a mate · Crocoducks · Banana argument · 747 Junkyard argument · Irreducible complexity · Chuck Missler's jar of peanut butter · What good is half a wing?
Notable Biologists   Charles Darwin · Alfred Russel Wallace · Thomas Huxley · Gregor Mendel · Stanley Miller · Norman Borlaug · Richard Lenski · Jerry Coyne · Richard Dawkins · PZ Myers
Notable quacks   William Dembski · Michael Behe · Geoffrey Simmons · Ken Ham · Michael Cremo
v · d Physics
Cosmology   Big bang · Relativity theory · The cosmos · Black holes
Quantum mechanics   Heisenberg Principle · Schrödinger's cat · Atomic decay
Physics straw men   Fine-tuning argument · Anthropic principle · Quantum mechanics and free will · Quantum mechanics and the after life · Quantum mechanics and Naturopathy · Something can't come from nothing
Notable Physicists   Plato · Isaac Newton · Albert Einstein · Maxwell Plank · Niels Bohr · Werner Heisenberg · Richard Feynman · Erwin Schrödinger · Freeman Dyson · Roger Penrose · Neil deGrasse Tyson · Stephen Hawking · Micho Kaku
Notable Quacks   Dinesh D'Souza · Ray Comfort
v · d Mathematics
Mathematics   Overview of mathematics · Numbers in reality · History of numbers
Statistics   Sample size · Selection bias · Data mining · Standard divination · Statistical significance · Statistical probability · Meta probability · Gambler's fallacy
Mathematics in nature   Golden ratio · Golden spiral · Fibonacci sequence
Mathematics and religion   Biblical value of pi · Noah's flood
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