Options: All option contracts of the same class that also have the same unit of trade, expiration date, and exercise price. Bloomberg Financial Dictionary
Stocks: shares that have common characteristics, such as rights to ownership and voting , dividends, or par value. In the case of many foreign shares, one series may be owned only by citizens of the country in which the stock is registered. Bloomberg Financial Dictionary
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All options of the same class which share a common strike price. Exchange Handbook Glossary
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series se‧ries [ˈsɪəriːz ǁ ˈsɪr-] noun [countable usually singular]
1. FINANCE a group of investments that mature (= become due for payment) at different times but which are covered by the same agreement between the person offering them and people who buy them. The word series is often used with a letter or date to show when the investments become payable:
• The Treasury's mortgage revenue bonds series 1998-99 are due Dec. 1, 2018.
• The C and D preferred stock series have a face value of $100.
2. a range of similar products that one company produces:
• the company's new Series 3 pocket computers
3. a group of events, actions etc of the same kind that happen one after the other:
• There is talk of a series of asset sales worth $2 billion, spread over three years.
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series UK US /ˈsɪəriːz/ noun [C] (plural series)
► a number of similar or related events or things, one following another: »
a series of events/interviews/meetings
a series of articles/books/studies »The is the first of a series of articles looking at financial instability.
»a series of steps/actions/transactions
»a series of crimes/attacks
► PRODUCTION a set or range of similar products made by a company: »
The company has announced two new lines, the 2200 series and the 2300 series.
► FINANCE, STOCK MARKET used in the name of a company's shares that have things in common, for example particular voting rights: »
Shares are called Series A if they are the first batch of a series of shares issued by the company.
Financial and business terms. 2012.