is an option for notebooks that gives definitions for the styles that can be used in a notebook.
- StyleDefinitions->"name.nb" specifies that style definitions from the notebook should be used.
- The standard notebook front end comes with a selection of style definition notebooks containing styles appropriate for particular purposes.
- StyleDefinitions->Notebook[...] allows style definitions to be given explicitly.
- The definition for a style named is specified by the options for the first cell whose contents is StyleData["s"].
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