Japanese
US /ˌdʒæp.ənˈiːz/
UK /ˌdʒæp.ənˈiːz/

1.
relating to Japan, its people, or its language
:
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She is studying Japanese history.
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He enjoys Japanese cuisine.
1.
the language of Japan
:
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She speaks fluent Japanese.
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Learning Japanese can be challenging but rewarding.