There are 3 main definitions of n in English:

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n 1

Pronunciation: /ɛn/

abbreviation

[in combination]
1(In units of measurement) nano- (10−9): 500 ng
2 Grammar Neuter.
3 (n-) [in combination] Chemistry Normal (denoting straight-chain hydrocarbons): n-hexane
4Note (used in a book’s index to refer to a footnote): 450n
5 Grammar Noun.

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: /ɛn/
(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: /ɛn/

abbreviation

1(Used in recording moves in chess) knight: 17.Na4?
Representing the pronunciation of kn-, since the initial letter k- represents 'king'
4 Physics Newton(s).
5 Chemistry (With reference to solutions) normal: the pH was adjusted to 7.0 with 1 N HCl
6North or Northern: 78° N N Ireland
7Norway (international vehicle registration).
8Nuclear: the N bomb

symbol

The chemical element nitrogen.
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