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principle

noun

prin·​ci·​ple ˈprin(t)-s(ə-)pəl How to pronounce principle (audio)
-sə-bəl
1
a
: a comprehensive and fundamental law, doctrine, or assumption
b(1)
: a rule or code of conduct
(2)
: habitual devotion to right principles
a man of principle
c
: the laws or facts of nature underlying the working of an artificial device
2
: a primary source : origin
3
a
: an underlying faculty or endowment
such principles of human nature as greed and curiosity
b
: an ingredient (such as a chemical) that exhibits or imparts a characteristic quality
4
capitalized Christian Science : a divine principle : god
Principle vs. Principal: Usage Guide

Evidence of confusion between principle and principal can be found even in publications overseen by professional editors. To keep these words straight, remember that principle functions only as a noun, and in its most common uses refers to a basic rule or law, as in

a guiding principle

or

a matter of principle.

If you are looking for an adjective form of this word, you must use principled, as in

taking a principled stand.

Principal functions as both a noun and an adjective. The noun has various meanings referring to someone with controlling authority

the school principal

or in a leading position

the ballet's two principals

, but also has meanings relating to finance, law, and architecture. As an adjective, principal typically means "most important," as in

the principal reason.

Phrases
in principle
: with respect to fundamentals
prepared to accept the proposition in principle

Synonyms

Example Sentences

Urban guerrilla warfare was futile against a thermonuclear superstate that would stop at nothing to defend the profit principle. Philip Roth, American Pastoral, 1997 Better, of course, to take a higher road, operate on the principle of service and see if things don't turn out better … Richard Ford, Independence Day, 1995 Pointlessness was life's principle, and it spread its sadness. Arthur Miller, Timebends, 1987 His investment strategy is based on the principle that the stock market offers the best returns for long-term investors. the basic principles of hydraulics
Recent Examples on the Web It’s not only an act of protection, but also a resounding principle for both brujas: a foundation rooted in cleansing, grounding, and protection. Marilyn La Jeunesse, Allure, 19 Sep. 2022 The court’s doctrine is a species of the separation of powers—specifically the nondelegation principle, which bars the legislature from giving lawmaking power to the executive branch. Bernard S. Sharfman And James R. Copland, WSJ, 14 Sep. 2022 This is the guiding principle of P.volve, a workout studio and streaming company specializing in what feels like a mash-up of Pilates and tai chi. Lauren Mechling, Vogue, 26 Aug. 2022 During the hearing Thursday on Kemp's attempt to avoid testifying, his lawyers argued that he is protected from having to testify by the principle of sovereign immunity, which says the state can’t be sued without its consent. Kate Brumback, BostonGlobe.com, 25 Aug. 2022 During the hearing Thursday on Kemp's attempt to avoid testifying, his lawyers argued that he is protected from having to testify by the principle of sovereign immunity, which says the state can't be sued without its consent. CBS News, 25 Aug. 2022 Mic principle: MEMS Mic frequency range: 50Hz to 10kHz. Mark Sparrow, Forbes, 8 Aug. 2022 The magnitude of this upward pushing buoyancy force is equal to the weight of the water displaced—that's called Archimedes’ principle. Wired, 31 July 2022 In its conception, the architect had one guiding principle: privacy. Giovana Gelhoren, PEOPLE.com, 27 July 2022 See More

Word History

Etymology

Middle English, from Middle French principe, principle, from Old French, from Latin principium beginning, from princip-, princeps initiator — more at prince

First Known Use

14th century, in the meaning defined at sense 1a

Time Traveler
The first known use of principle was in the 14th century

Phrases Containing principle

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