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principle US English

A fundamental truth or proposition that serves as the foundation for a system of belief or behavior or for a chain of reasoning

principle US Thesaurus

elementary principles

principle New Oxford Dictionary for Writers & Editors

fundamental truth or proposition;

law of the excluded middle US English

The principle that one (and one only) of two contradictory propositions must be true

in principle US English

As a general idea or plan, although the details are not yet established or clear

on principle US English

Because of or in order to demonstrate one’s adherence to a particular belief

Mach's principle US English

The hypothesis that a body’s inertial mass results from its interaction with the rest of the matter in the universe

Peter Principle US English

The principle that members of a hierarchy are promoted until they reach the level at which they are no longer competent

Peter Principle New Oxford Dictionary for Writers & Editors

members of a hierarchy are promoted until reaching a level at which they are incompetent

Nirvana principle US English

Yearning for a state of oblivion, as a manifestation of the death instinct

pleasure principle US English

The instinctive drive to seek pleasure and avoid pain, expressed by the id as a basic motivating force that reduces psychic tension

reality principle US English

The ego’s control of the pleasure-seeking activity of the id in order to meet the demands of the external world

anthropic principle US English

The cosmological principle that theories of the universe are constrained by the necessity to allow human existence

Archimedes' principle US English

A result stating that a body totally or partially immersed in a fluid is subject to an upward force equal in magnitude to the weight of fluid it displaces

Bernoulli's principle US English

The principle in hydrodynamics that an increase in the velocity of a stream of fluid results in a decrease in pressure. Also called Bernoulli effect or Bernoulli theorem

equivalence principle US English

A basic postulate of general relativity, stating that at any point of space-time the effects of a gravitational field cannot be experimentally distinguished from those due to an accelerated frame of reference

exclusion principle US English

See Pauli, Wolfgang.

uncertainty principle US English

The principle that the momentum and position of a particle cannot both be precisely determined at the same time

verification principle US English

The characteristic doctrine of logical positivism, that a statement which cannot be verified is strictly meaningless

correspondence principle US English

The principle that states that for very large quantum numbers the laws of quantum theory merge with those of classical physics

indeterminacy principle US English

Another term for uncertainty principle.

precautionary principle US English

The principle that the introduction of a new product or process whose ultimate effects are disputed or unknown should be resisted. It has mainly been used to prohibit the importation of genetically modified organisms and food

Le Chatelier's principle US English

A principle stating that if a constraint (such as a change in pressure, temperature, or concentration of a reactant) is applied to a system in equilibrium, the equilibrium will shift so as to tend to counteract the effect of the constraint

principle of parsimony US English

The scientific principle that things are usually connected or behave in the simplest or most economical way, especially with reference to alternative evolutionary pathways

Pauli exclusion principle US English

The assertion that no two fermions can have the same quantum number

in principle in principle US English

As a general idea or plan, although the details are not yet established or clear

on principle in principle US English

Because of or in order to demonstrate one’s adherence to a particular belief

first principles US English

The fundamental concepts or assumptions on which a theory, system, or method is based

principle of parsimony in parsimony US English

The scientific principle that things are usually connected or behave in the simplest or most economical way, especially with reference to alternative evolutionary pathways

in principle in principle US Thesaurus

there is no reason, in principle, why we couldn't work together

Pauli's exclusion principle in Pauli exclusion principle US English

The assertion that no two fermions can have the same quantum number

exclusion principle in Pauli, Wolfgang US English

(1900–58), US physicist, born in Austria. He made a major contribution to quantum theory with his exclusion principle, according to which only two electrons in an atom could occupy the same quantum level, provided they had opposite spins. Nobel Prize for Physics (1945)

law of the excluded middle in exclude US English

The principle that one (and one only) of two contradictory propositions must be true

principle or law of parsimony in parsimony US English

The scientific principle that things are usually connected or behave in the simplest or most economical way, especially with reference to alternative evolutionary pathways

Heisenberg uncertainty principle in Heisenberg New Oxford Dictionary for Writers & Editors

, Werner Karl (1901–76), German physicist, discoverer of the Heisenberg uncertainty principle


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