N.A.

1.
National Army.
2.
North America.
3.
not applicable.
4.
Microscopy. .
Latin non allocatur (it is not allowed)
North America

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NAACP
1. National Association for the Advancement of Colored People. abbreviation (in the US) 1. National Association for the Advancement of Colored People abbreviation of National Association for the Advancement of Colored People, first attested 1910. Organization founded Feb. 12, 1909, as National Negro Committee. National Association for the Advancement of Colored People