The principle of the excluding third or principium tertium exclusum is a principle of the traditional logic formulated canonically by Leibniz as: either A is B or A isn't B. It is read the following way: either P is true, or its denial ¬ P is. It is also known as  tertium non datur  ('A third (thing) is not).
https://en.wikipedia.org/wiki/Principle
(April 2013). A principle is a law or rule that has to be, or usually is to be followed, or can be desirably followed, or is an inevitable consequence of something, such as the laws observed in nature or the way that a system is constructed.
https://en.wikipedia.org/wiki/Principle
Principal. Principal can refer to an amount of money you invest, the face amount of a bond, or the balance you owe on a debt, distinct from the finance charges you pay to borrow. A principal is also a person for whom a broker carries out a trade, or a person who executes a trade on his or her own behalf. (1) One who has permitted or instructed another—called an agent—to act on his or her behalf and according to his or her instructions.
http://financial-dictionary.thefreedictionary.com/Principal
Science does not recognize the finality of the natural causes as a guiding principle of investigation. It is also understood therefore that the principle guides the action as a norm or rule of behaviour, which produces two types of principle.
https://en.wikipedia.org/wiki/Principle
For this reason the principle of cause is considered to be a determining factor in the production of facts. The principle of causality states that every event has a cause; for instance, everything that begins to exist must have a cause. It was formulated by Aristotle's theory which states that: Everything that moves is moved by another.
https://en.wikipedia.org/wiki/Principle
The UN Global Compact’s Ten Principles are derived from: the Universal Declaration of Human Rights, the International Labour Organization’s Declaration on Fundamental Principles and Rights at Work, the Rio Declaration on Environment and Development, and the United Nations Convention Against Corruption.
https://www.unglobalcompact.org/what-is-gc/mission/principles
Principal. 1  The principal objective is to make a profit. 2  The inspector highlighted my principal concern in his opening sentence. 3  Here comes the principal. 4  The allegations against the former principal were that he not only allowed the cage fights to take place, but he also he egged on the participants.
http://www.grammar-monster.com/easily_confused/principal_principle.htm
1 The principal objective is to make a profit. 2  The inspector highlighted my principal concern in his opening sentence. 3  Here comes the principal. 4  The allegations against the former principal were that he not only allowed the cage fights to take place, but he also he egged on the participants.
http://www.grammar-monster.com/easily_confused/principal_principle.htm
1 The inspector highlighted my principal concern in his opening sentence. 2  Here comes the principal. 3  The allegations against the former principal were that he not only allowed the cage fights to take place, but he also he egged on the participants.
http://www.grammar-monster.com/easily_confused/principal_principle.htm
By incorporating the Global Compact principles into strategies, policies and procedures, and establishing a culture of integrity, companies are not only upholding their basic responsibilities to people and planet, but also setting the stage for long-term success.
https://www.unglobalcompact.org/what-is-gc/mission/principles
what is the principle?
The principle is a law or rule that has to be, or usually is to be followed, or can be desirably followed, or is an inevitable consequence of something, such as the laws observed in nature or the way that a system is constructed.