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staple

noun [C] (BASIC)
 
 
/ˈsteɪ.pl̩/

Definition

a main product or part of something: Shortages mean that even staples (= basic foods) like bread are difficult to find. Phosphate has been a staple of this area for many years. Romantic fiction and reference books are a staple of many public libraries.Standard and routine
(Definition of staple noun (BASIC) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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