Definitions from Wiktionary ( )

▸ noun:  A fundamental assumption or guiding belief.
▸ noun:  A rule used to choose among solutions to a problem.
▸ noun:  (sometimes pluralized) Moral rule or aspect.
▸ noun:  (physics) A rule or law of nature, or the basic idea on how the laws of nature are applied.
▸ noun:  A fundamental essence, particularly one producing a given quality.
▸ noun:  A chemical compound within plant or animal tissue that is characteristic of it and more or less peculiar to it, such that it defines the character of that tissue from a human viewpoint (as for example nicotine in tobacco).
▸ noun:  A source, or origin; that from which anything proceeds; fundamental substance or energy; primordial substance; ultimate element, or cause.
▸ noun:  An original faculty or endowment.
▸ noun:  (obsolete) A beginning.
▸ verb:  (transitive) To equip with principles; to establish, or fix, in certain principles; to impress with any tenet or rule of conduct.
▸ noun:  Misspelling of principal. [(finance, uncountable) The money originally invested or loaned, on which basis interest and returns are calculated.]

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