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The meaning of PRINCIPAL is most important, consequential, or influential : chief. How to use principal in a sentence.

PRINCIPAL definition: first or highest in rank, importance, value, etc.; chief; foremost. See examples of principal used in a sentence.

Jul 29, 2025 · "Principal" refers to the primary leader, the main financial amount, or the most significant aspect in various contexts. Understanding the term's use and flexibility is important for clear …

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

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1 principal / ˈ prɪnsəpəl/ adjective Britannica Dictionary definition of PRINCIPAL always used before a noun : most important : chief