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Principal (academia) The principal is the chief executive and the chief academic officer of a university or college in certain parts of the Commonwealth . In the United States, the principal is the head of school at most pre-university, non-boarding schools.
Principal (music) The section principal in an orchestra, as well as any large musical ensemble, is the lead player for each respective section of instruments. For example, there are multiple sections in an orchestra. The strings, woodwinds, brass, and percussion sections all have subsections. The first violins, second violins, violas, cellos ...
v. t. e. In commercial law, a principal is a person, legal or natural, who authorizes an agent to act to create one or more legal relationships with a third party. This branch of law is called agency and relies on the common law proposition qui facit per alium, facit per se (from Latin: "he who acts through another, acts personally").
Principal value. In mathematics, specifically complex analysis, the principal values of a multivalued function are the values along one chosen branch of that function, so that it is single-valued. A simple case arises in taking the square root of a positive real number. For example, 4 has two square roots: 2 and −2; of these the positive root ...
A principle is a fundamental truth or proposition that serves as the foundation for a system of beliefs or behavior or a chain of reasoning. [2] That is a guide for behavior or evaluation. In law, it is a rule that has to be or usually is to be followed. It can be desirably followed, or it can be an inevitable consequence of something, such as ...
The principal quantum number was first created for use in the semiclassical Bohr model of the atom, distinguishing between different energy levels. With the development of modern quantum mechanics, the simple Bohr model was replaced with a more complex theory of atomic orbitals. However, the modern theory still requires the principal quantum ...
Square root. Notation for the (principal) square root of x. For example, √ 25 = 5, since 25 = 5 ⋅ 5, or 52 (5 squared). In mathematics, a square root of a number x is a number y such that ; in other words, a number y whose square (the result of multiplying the number by itself, or ) is x. [1] For example, 4 and −4 are square roots of 16 ...
Principal (commercial law), the person who authorizes an agent. Principal (architecture), licensed professional (s) with ownership of the firm. Principal (criminal law), the primary actor in a criminal offense. Principal (Catholic Church), an honorific used in the See of Lisbon.