IPA: /ˈkɒmənˌælti/
KK: /ˈkɒmənˌælti/
A group of people, especially those who are not part of the upper classes; the general population.
The commonalty gathered to discuss their rights and needs.
Commonalty is formed from "common" (from Old French *comun*, meaning shared by all) and "-alty" (a suffix denoting a state or condition). The word refers to the state of being common or shared among a group of people.
Think of 'common' as something shared by everyone, and '-alty' indicating a state. This helps you remember that 'commonalty' refers to the state of being common among people.