There are 3 main definitions of sr in English:

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sr1

Line breaks: sr

abbreviation

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There are 3 main definitions of sr in English:

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Sr2

Line breaks: Sr

abbreviation

1Senior (in names): E. T. Krebs Sr
1.3Sister (in a religious order): [as a title]: Sr Agatha

symbol

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The chemical element strontium.

Definition of sr in:

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There are 3 main definitions of sr in English:

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SR3

Line breaks: SR

abbreviation

historical
(In the UK) Southern Railway.

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