(philosophy) The proposition that nothing happens without a sufficient reason why it should be as it is and not otherwise.

(historical) The political philosophy espoused by Sun Yat-sen and the Chinese Nationalist Party.

(mathematics) A principle that gives a condition for finding the eigenvalues for a real symmetric matrix.

(lexicography) A type of scholarly dictionary that displays the history of lexical items through citations.

plural of dictionary on historical principles

Synonym of principle of least astonishment

Synonym of principle of indifference

(physics) also known as the stationary action principle. In complex systems, the tendency for any movement or change to use the least action, and therefore amount of energy possible. This is true on a subatomic level, on the population level (evolution), and on a macro level. Not considered a law of physics because it is not true 100% of the time.

Is a principle referring to the idea that firms responsible for causing pollution should be charged the full external costs for the damage that it inflicts on society.

The principle that the parties in a transaction should be independent and on an equal footing, without any favorable treatment, fiduciary duties, etc.