An overall explanation of phenomena in a particular discipline or realm of experience such as economics, sociology, or history.

(mathematics) A formula giving the expansion of a binomial such as (a+b) raised to any positive integer power, i.e. (a+b)ⁿ. It's possible to expand the power into a sum of terms of the form axᵇyᶜ where the coefficient of each term is a positive integer. For example:

(physics) A theorem in mechanics showing the relationship between the kinetic energy of a system to the virial of Clausius.

(mathematics) the probability that a certain outcome will occur, as determined through reasoning or calculation.

(chemistry) An alkaloid, of similar structure to caffeine, found in chocolate and cocoa.

(physics) The theory that all gross matter is composed of atoms. / (physics) Any of several theories that explain the structure of the atom, and of subatomic particles.

(physics) The theories of special relativity and general relativity, two theories in physics developed mainly by Albert Einstein at the beginning of the 20th century from which several important results such as the equivalence of matter and energy and the Einstein field equations are derived.

(dated) atomic theory

The branch of mathematics dealing with the algebraic structure of fields. / (psychology) A theory which examines patterns of interaction between individuals and their environment.

(logic) A branch of mathematical logic studying computable functions and Turing degrees, concerned with questions such as "What does it mean for a function on the natural numbers to be computable?" and "Can noncomputable functions be classified into a hierarchy based on their level of noncomputability?".