denim//ˈdɛnɪm//B1Frequency Level 11NeutralNoundenimSingulardenimsPlural1A sturdy cotton twill fabric, typically blue, used especially for jeans and other casual clothing.She bought a denim jacket to wear with her jeans.2Clothing made from denim fabric, especially jeans.She wore her favorite denim to the concert.Synonymjeandungaree