There are 2 definitions of Ni in English:

Ni1

Line breaks: Ni

symbol

The chemical element nickel.

Definition of Ni in:

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Word of the day antebellum
Pronunciation: ˌantēˈbeləm
adjective
occurring or existing before a particular war…

There are 2 definitions of Ni in English:

NI2

Line breaks: NI

abbreviation

1(In the UK) National Insurance.
1.1Northern Ireland.
1.2(In New Zealand) the North Island.