soldering I. noun (-s) Etymology: from gerund of solder (II) 1.: an act or instance of using solder < his soldering was very neat > 2.: solder 1 3.: a joint, repair, or distinctive mark made by soldering : a soldered place < the solderings should be polished clean > II. adjective : used in the process of uniting by solder < soldering tools > < a soldering flux >