Calendar spread - Financial definition
Concise definition of the term calendar spread
(1) The purchase of one delivery month of a given futures contract and simultaneous sale of a different delivery month of the same futures contract.
(2) The purchase of a put or a call option and the simultaneous sale of the same type of option on the same underlying and typically with the same strike price, but with a different expiry.
Comprehensive definition of the term calendar spread
Also called horizontal spread or time spread