jointjoint1adjectiveinvolving two or more people together: The report was a joint effort (= we worked on it together).My wife and I have a joint account (= a shared bank account)jointjointjointsjointedjointing2noun1a part of your body where bones come together, for example your elbow or your knee2a place where two parts of something join together: the joints of the pipe3(British) a big piece of meat that you cook: a joint of beef