N : the fourteenth letter of English alphabet, is a vocal consonent, and, in allusion to its mode of formation, is called the dentinasal or linguanasal consonent. Its commoner sound is that heard in ran, done; but when immediately followed in the same word by the sound of g hard or k (as in single, sink, conquer), it usually represents the same sound as the digraph ng in sing, bring, etc. This is a simple but related sound, and is called the gutturo-nasal consonent. See Guide to Pronunciation, // 243-246.

N n. : A measure of space equal to half an M (or em); an en.

Example:
What is short gear ratio N how to elimiNate gears iN your car?

Taxonomy
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Defination from the web:
Official site of The New York Times provides national and world news as well as the latest on sports, technology, health, and science. Some registration required.