soldering sol·de·ring UK/ˈsəʊld(ə)ɹɪŋ/ US/ˈsɑdəɹɪŋ/ rare noun 1. fastening firmly together Synonymsbonding Related words Word family solder Broader terms fastening WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.