Marchioness
/ˌmɑːrʃəˈnes/
Definition 1 of 1
Pro Tip 1/3Nobility Titles
Marchioness is a noble title. It's important in historical or royal contexts. 
In the novel, the marchioness resides in an ancient castle.
Pro Tip 2/3Confusing Titles
Don't confuse 'marchioness' with 'marquess'; 'marchioness' refers specifically to a woman. 
Her mother held the title of marchioness, while her father was a marquess.
Pro Tip 3/3Respect in Address
Use 'marchioness' as a formal title when addressing or referring to a woman with respect. 
May I introduce the Marchioness of Winchester?