IPA: /ˈkaʊntəs/
KK: /ˈkaʊntɪs/
A woman who has the title of count or earl, or the wife or widow of a count or earl in certain European countries.
The countess hosted a grand ball at her estate.
Countess → It is formed from "count" (from Old French *comte*, meaning a nobleman or ruler) and "-ess" (a suffix used to denote female gender). The word "countess" refers to a female noble who holds the rank equivalent to a count.
Think of a 'count' as a nobleman and the '-ess' as indicating a female — that's how a countess is a female noble.