Joint  —n. 1 place at which two or more things or parts of a structure are joined; device for joining these. 2 point at which two bones fit together. 3 division of an animal carcass as meat. 4 slang restaurant, bar, etc. 5 slang marijuana cigarette. 6 geol. Crack in rock. —adj. 1 held, done by, or belonging to, two or more persons etc. (joint mortgage; joint action). 2 sharing with another (joint author; joint favourite). —v. 1 connect by joint(s). 2 divide at a joint or into joints.  out of joint 1 (of a bone) dislocated. 2 out of order.  jointly adv. [french: related to *join]