There are 3 main definitions of n in English:

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n 1

Pronunciation:

abbreviation

1Name.
2 [in combination] (In units of measurement) nano- (109): the plates were coated with 500 ng of protein in sodium carbonate buffer
3Born.
From Latin nātus
5Net.
6 Grammar Neuter.
7New.
10 (n-) [in combination] Chemistry Normal (denoting straight-chain hydrocarbons): n-hexane
11North or northern.
12Note (used in a book’s index to refer to a footnote): 450n
13 Finance Note.
14 Grammar Noun.
15Number.

symbol

An unspecified or variable number: at the limit where n equals infinity See also nth.
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There are 3 main definitions of n in English:

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N 2

Pronunciation: /en/
(also n)

noun (plural Ns or N's)

1The fourteenth letter of the alphabet. See also en.
1.1Denoting the next after M in a set of items, categories, etc.
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There are 3 main definitions of n in English:

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N 3

Pronunciation: /en/

abbreviation

1(Used in recording moves in chess) knight: 17.Na4?
N represents knight, since the initial letter k- represents 'king'
5 Physics Newton(s).
7 Chemistry (With reference to solutions) normal: the pH was adjusted to 7.0 with 1 N HCl
9North or Northern: 78° N N Ireland
10 Finance Note.
11Nuclear: the N bomb

symbol

The chemical element nitrogen.
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