Scarcity or being in the minority; a classical/archaic term indicating small numbers.
その地域では支持者が寡で、政党は苦戦している。
In that region supporters are few, and the party is struggling.
An archaic term referring to an unmarried person or someone without a spouse; sometimes implies widow or widower in older usage.
昔の文献では『寡』という語が未婚や寡婦を意味することがある。
In older texts the word '寡' sometimes means unmarried person or widow/widower.