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Finance Dictionary and Glossary of Investment Terms
In the case of derivative products, options of the same type-put or call-with the same underlying security. See: Series. In general, refers to a category of assets such as: domestic equity, fixed income, etc.
In the most general form, a class is a group of securities with similar features.
Type, as of a security. For options, puts and calls of the same security are considered different classes.