IPA: /ˈkɒmənə/
KK: /ˈkɑːmənər/
A person who does not have a noble title or rank and is part of the general population.
In the past, commoners had limited rights compared to nobles.
Commoner → It is formed from "common" (from Old French *comun*, meaning shared or belonging to all) and "-er" (meaning a person who). A commoner is a person who belongs to the general population, as opposed to the nobility or aristocracy.
Think of someone who is part of the 'shared' ('common') group of people — that's what a commoner is.