Definition of the Nikkei index noun from the Oxford Advanced American Dictionary

 

the Nikkei index

 noun
noun
NAmE//ˈnikeɪ ˌɪndɛks//
 
(also the Nikkei average)[singular]
 
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a figure that shows the relative price of shares on the Tokyo Stock Exchange
See the Oxford Advanced Learner's Dictionary entry: the Nikkei index