connect, junction, conjoin, unite, bring together, sum, link, joint, union, juncture, more...

separate, divide, disconnect, detach, sever

butt joint, lap joint, mitre joint, dovetail joint, biscuit joint, finger joint, more...

hash, fork, self, natural, left, merge, select, first, form, multi, late

get on board,   become a part of,   become part of,   enlist in,   be apart of,   fuse together,   to unite,   become a member,   to merge,   to participate