Nikkei /ˈniːkeɪ/adjective 1noun 2forms 6 adjective1 •overseas Japanese noun2 •overseas ethnic Japanese person (usually has no Japanese citizenship living as citizens of other countries as immigrants or descendants of Japanese immigrants) •Ellipsis of Nikkei index. formsNikkeis · nikkeis · more Nikkei · more nikkei · most Nikkei · most nikkei