joint adj1 : common to two or more: as
a : involving the combined activity or negligence of two or more [a tort] see also joint tortfeasor compare several
b : shared by or affecting two or more as a unit [a account]
2 : united, joined, or sharing with another (as in a right or status) [ heirs]
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.