A theory is an abstract or systematic explanation of some phenomenon or subject matter. A scientific theory is more substantial than a conjecture or hypothesis, but may not be verified as consistent with empirical data. <ref>For example, scientists may refer to phlogiston theory or ether theory, even though empirical verification was lacking.</ref>
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A '''scientific theory''' is more substantial than a conjecture or hypothesis, but may not be verified as consistent with empirical data. <ref>For example, scientists may refer to phlogiston theory or ether theory, even though empirical verification was lacking.</ref>
The term theory is often used outside of science, such as in music theory, number theory, or Marxist theory.
The term theory is often used outside of science, such as in music theory, number theory, or Marxist theory.