The opposite of disjoining is joining, which means to bring together. Joining is the action of connecting or uniting. It is the opposite of disjoining, which means to separate or disconnect. Other antonyms of disjoining are connecting, coupling, and linking, which all mean to bring together. Welding, fusing, merging, and integrating are also antonyms for disjoining because they imply the combination of two or more parts into a whole. Therefore, depending on the context, different antonyms can be identified for the word disjoining, but they all imply bringing things together as opposed to separating them.