There are 3 definitions of na in English:

na1

Syllabification: na

adverb

Scottish form of not, used after an auxiliary verb. I couldna sleep nights

Definition of na in:

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

There are 3 definitions of na in English:

Na2

Syllabification: Na

symbol

The chemical element sodium.

Origin

from modern Latin natrium.

Definition of na in:

There are 3 definitions of na in English:

NA3

Syllabification: NA

abbreviation

1National Army.
1.1North America.
1.2Not applicable.
1.3Numerical aperture.