For an adjective that points to the main or most important thing, your best choice is principal . Is your principal goal for the summer to have fun or to earn some extra money? Principal definition: first or highest in rank, importance, value, etc.; chief; foremost.. See examples of PRINCIPAL used in a sentence. Define principal . principal synonyms, principal pronunciation, principal translation, English dictionary definition of principal . main; foremost; the person in charge: the school principal ; a capital sum Not to be confused with: principle – essential quality; law; moral rule: true to... Principle and principal are often confused for one another. The first is only a noun and refers to code or laws that govern the universe or ones behavior. Principal can be both a noun and an adjective referring to something very important, or frequently, the head of a school. Read on for tricks to remember the difference.

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