The term "cause of action" is neither defined in the Act nor in the Code of Civil Procedure, 1908 but is of wide import. It has different meanings in different contexts, that is when used in the context of territorial jurisdiction or limitation or the accrual of right to sue. JT 2009 (4) SC 191 (2003) 9 SCC 50 (2006) 1 SCC 164 Generally, it is described as "bundle of facts", which if proved or admitted entitle the plaintiff to the relief prayed for. Pithily stated, "cause of action" means the cause of action for which the suit is brought. "Cause of action" is cause of action which gives occasion for and forms the foundation of the suit. (See: Sidramappa Vs. Rajashetty & Ors.4).
http://indiankanoon.org/doc/1592293/
Supreme Court of India
Kandimalla Raghavaiah & Co vs National Insurance Co. & Anr on 10 July, 2009
Bench: D.K. Jain, R.M. Lodha