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principal

adjective [before noun]
 
 
/ˈprɪn.sɪ.pəl/

Definition

B1 first in order of importance: Iraq's principal export is oil. He was principal dancer at the Dance Theatre of Harlem. That was my principal reason for moving.Very important or urgent
(Definition of principal adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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