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The word, principal, comes from the Latin principalis "first in importance" and is related to the title of prince. You can see the relation when you think about its meanings — the head of a school, the …

There are 41 meanings listed in OED's entry for the word principal, 12 of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Chief; highest in rank, authority, value, or importance; most considerable; main; first: as, the principal officers of a government; the principal points in an argument; the principal products of a country.

Primary; most important. Smith is the principal architect of this design. The principal cause of the failure was poor planning.

Prin′cipalness, the state of being principal or chief; Prin′cipalship, position of a principal; Prin′cipate, primary: a principality, esp. the office of the ancient Roman emperors.

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