N.A.

1. National Army.

2. North America.

3. not applicable.

4. Micros. See numerical aperture.

* * *

na «nah, nuh», adverb, conjunction. Scottish.

–adv.

1. no.

2. not (in compounds with could, should, etc.): »

He canna sit still.

–conj.

Obsolete. nor.

╂[Old English nā]

n.a.,

not available.

n/a (no periods),

Bookkeeping. no account.

Na (no period),

sodium (chemical element).

NA (no periods),

1. noradrenaline.

2. Optics. numerical aperture.

N.A.,

1. a) National Academy. b) National Academician.

2. a) North Africa. b) North African.

3. a) North America. b) North American.