There are 3 main definitions of n in English:

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n1

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abbreviation

[in combination]
1(In units of measurement) nano- (10−9): 500 ng
1.1 Grammar Neuter.
1.2 (n-) [in combination] Chemistry Normal (denoting straight-chain hydrocarbons): n-hexane
1.3Note (used in a book’s index to refer to a footnote): 450n
1.4 Grammar Noun.

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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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N2

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(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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N3

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abbreviation

1(Used in recording moves in chess) knight: 17.Na4?
[representing the pronunciation of kn-, since the initial letter k- represents 'king']
1.1(On a gear lever) neutral.
1.3 Physics Newton(s).
1.4 Chemistry (With reference to solutions) normal: the pH was adjusted to 7.0 with 1 N HCl
1.5North or Northern: 78° N N Ireland
1.7Nuclear: the N bomb

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The chemical element nitrogen.

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