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Definition of stability ball noun from the Oxford Advanced Learner's Dictionary

stability ball

noun
 
/stəˈbɪləti bɔːl/
 
/stəˈbɪləti bɔːl/
(North American English)
(also exercise ball, Swiss ball™ both British and North American English)
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  1. a large ball that you can sit on when doing exercises to make your muscles work in a different way
See stability ball in the Oxford Advanced American Dictionary

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