Principal vs. Principle. Sounding the same and being spelled very similarly, these two words are commonly confused in business writing. Keeping the two words straight will ensure that others clearly understand your work and the meaning is sound from a legal perspective. A ...
http://www.businessdictionary.com/definition/objective-principle.html
The words principle and principal are pronounced in the same way but they do not have the same meaning. Principle is normally used as a noun meaning ‘a fundamental basis of a system of thought or belief’, as in this is one of the basic principles of democracy. Principal, on the other hand, is normally an adjective meaning ‘main or most important’, as in one of the country's principal cities. Principal can also be a noun, where it is used to refer to the most senior or most important person in an organization or other group: the deputy principal.
https://en.oxforddictionaries.com/definition/principle
Phrases. 1  in principle. 2  1As a general idea or plan, although the details are not yet established. ‘the government agreed in principle to a peace plan that included a ceasefire’. ‘Members approved the ideas in principle, and agreed they would like another report on progress in July.’.
https://en.oxforddictionaries.com/definition/principle
principal. 1  the chief instrumentalist in a section of the orchestra. 2  one of the singers in an opera company. 3  either of two types of open diapason organ stops, one of four-foot length and pitch and the other of eight-foot length and pitch.
http://www.dictionary.com/browse/principal
Principal means primary or chief — like the principal of a school — while principle generally refers to a rule, law, or general truth. Principle is always used as a noun; principal is usually used as an adjective but can also be a noun. Principal and principle are homophones.
https://www.diffen.com/difference/Principal_vs_Principle
Principal can also be a noun, where it is used to refer to the most senior or most important person in an organization or other group: the deputy principal Phrases in principle
https://en.oxforddictionaries.com/definition/principle
Definition of principle - a fundamental truth or proposition that serves as the foundation for a system of belief or behaviour or for a chain of reasoning,
https://en.oxforddictionaries.com/definition/principle
noun. 1  1A fundamental truth or proposition that serves as the foundation for a system of belief or behaviour or for a chain of reasoning. 2  2A general scientific theorem or law that has numerous special applications across a wide field. 3  3A fundamental source or basis of something.
https://en.oxforddictionaries.com/definition/principle
Principal, which can be used as an adjective or noun, conveys the meaning of primary or chief. For example, there may be principal tasks (adjective use) that an employee must see to before others, and schools have principals (noun use).
https://www.diffen.com/difference/Principal_vs_Principle
Principal means 'primary' or 'chief' — like the principal of a school — while principle generally refers to a rule, law, or general truth. Principle is always used as a noun; principal is usually used as an adjective but can also be a noun.
https://www.diffen.com/difference/Principal_vs_Principle
principal adjective definition
Principal adjective is a principal, which can be used as an adjective or noun, conveys the meaning of primary or chief. Principal in adjective definition conveys the meaning of primary or chief