
In finance, a calendar spread (also called a time spread or horizontal spread) is a spread trade involving the simultaneous purchase of futures or options expiring at particular date and the sale of the same instrument expiring another date. The legs of the spread vary only in expiration date; they are based on the same underlying market and strik...
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http://en.wikipedia.org/wiki/Calendar_spread

Applies to derivative products. A strategy in which there is a simultaneous purchase and sale of opt
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http://www.encyclo.co.uk/local/22402

Buying (selling) the calendar spread involves the simultaneous purchase (sale) of contract(s) in a near delivery month and the sale (purchase) of an equal number of contract(s) in a far delivery month of the same futures contract.
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The sale (purchase) of a near month call option (put option) and the simultaneous purchase (sale) of... <a target=_blank href='http://www.finance-glossary.com/terms/calendar-spread.htm?id=2041&ginPtrCode=00000&PopupMode=false' title='Read full definition of calendar spread'>more</a>
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An option spread whereby a pair of calls or puts for the same strike price but different expiration is traded simultaneously, one bought and one sold.
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See Horizontal Spread.
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http://www.oasismanagement.com/glossary/
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