There are 2 definitions of Sn in English:

Sn1

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symbol

The chemical element tin.

Origin

from late Latin stannum 'tin'.

Definition of Sn in:

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Word of the day antebellum
Pronunciation: ˌantɪˈbɛləm
adjective
occurring or existing before a particular war…

There are 2 definitions of Sn in English:

SN2

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abbreviation

Senegal (international vehicle registration).