From Longman Dictionary of Contemporary EnglishNikkei index, thethe Nikkei indexNik‧kei in‧dex, the /ˌnɪkeɪ ˈɪndeks/ (also the Nikkei, the Nikkei Average) a number that shows how well or badly shares have performed on the Tokyo stock exchange on a particular day. The number is based on the share prices of about 200 important companies. → see also Dow Jones Average, FT 100 Share Index, the, Hang Seng Index, theFrom Longman Business DictionaryNikkei indexˈNikkei ˌindex (also Nikkei average) [singular]FINANCE the main share index of shares in companies on the Tokyo stockmarketThe Nikkei index fell by 40% during the year. → index
