Definition of na in English:

na

adverb

  • ‘I couldna sleep nights’
    Scottish form of not, used after an auxiliary verb

Definition of Na in English:

Na

  • The chemical element sodium.

Origin

From modern Latin natrium.

Definition of NA in English:

NA

  • 1National Army.

  • 2North America.

  • 3Not applicable.

  • 4Numerical aperture.