etholiad achlysurol

== Welsh == === Etymology === Literally, “occasional election”. === Noun === etholiad achlysurol m (plural etholiadau achlysurol) (politics) by-election Synonym: is-etholiad ==== Coordinate terms ==== etholiad cyffredinol (“general election”) === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “etholiad achlysurol”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies