There are 2 definitions of Np in English:

Np1

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symbol

The chemical element neptunium.

Definition of Np in:

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Word of the day humoresque
Pronunciation: ˌhjuːməˈrɛsk
noun
a short, lively piece of music

There are 2 definitions of Np in English:

NP2

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abbreviation

Notary public.

Definition of Np in: