What does N/A stand for?

MLA style: "N/A." Acronym Finder . 2012. AcronymFinder.com 1 Jun. 2012 http://www.acronymfinder.com/Non_Aspirated-(engine)-(N%2fA).html
Chicago style: Acronym Finder . S.v. "N/A." Retrieved June 1 2012 from http://www.acronymfinder.com/Non_Aspirated-(engine)-(N%2fA).html
APA style: N/A. (n.d.) Acronym Finder. (2012). Retrieved June 1 2012 from http://www.acronymfinder.com/Non_Aspirated-(engine)-(N%2fA).html

Non-Aspirated (engine)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Nach Christus (German: After Christ) No Date (reference materials) Nautical mile Na Przyk³ad (Polish: For Example) N/A Naturally Aspirated (non-turbocharged/non-supercharged engine) Never Again No Answer Non Action Non Alcoholic		North America Not Acceptable Not Applicable Not Available Not Available new condition Newton Per Coulomb No Change No Charge No Comment

Samples in periodicals archive:

A fundamental question connected with the distinction between the traditional voiced-voiceless plosives, even if approached phonetically as non-aspirated -- aspirated in the present-day language, is the nature of the phonological contrast in focus.

The dental suffix in modern Icelandic: phonology, morpho(phono)logy, ...