synonymity n the semantic relation that holds between two words that can (in a given context) express the same meaning Usage(s) In 56 years of rule, he restored Monaco from near bankruptcy to synonymity with glamour and extravagant, if secret, wealth. That synonymity developed a half century ago when the late Meyer Guggenheim started a smelter in Colorado for his seven sons. In 56 years of rule, he restored Monaco from near bankruptcy to synonymity with glamour and extravagant, if secret, wealth. Synonym(s) synonymy synonymousness