Definition of staple adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈsteɪpl//
; NAmE NAmE//ˈsteɪpl//
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[only before noun] forming a basic, large or important part of something The staple crop is rice. Jeans are a staple part of everyone's wardrobe. Word Originadjective Middle English (originally referring to a centre of trade): from Old French estaple ‘market’, from Middle Low German, Middle Dutch stapel ‘pillar, emporium’; related to the verb staple.
See the Oxford Advanced American Dictionary entry: staple