mistress

noun

mis·​tress ˈmi-strəs 

plural mistresses

1

: a woman who has power, authority, or ownership: such as

a

: the female head of a household

the mistress of the house

b

: a woman who employs or supervises servants

The servants did their mistress's bidding without question.

c

: a woman who possesses, owns, or controls something

the mistress of a large fortune

d

: a woman who is in charge of a school or other establishment : headmistress

Mrs. Goddard was the mistress of a school …

—Jane Austen

e

: a woman of the Scottish nobility having a status comparable to that of a master (see master sense 3b)

f

: a woman who owns a pet (as a dog)

Whether mongrels or thoroughbreds … dogs have shared their masters' and mistresses' experiences in almost all walks of life.

—Robert Rosenblum

2

a

chiefly British : a female teacher or tutor

b

: a woman who has achieved mastery in some field

She was a mistress of music.

You learn how to chop throats and gouge eyes and stomp insteps … and after eight weeks you're given your diploma, which officially declares you a mistress of unarmed combat.

—Arthur R. Miller

c

: a woman considered especially notable for something

After penning several apocalyptic books, she became known as the mistress of doom.

3

: something personified as female that rules, directs, or dominates

… France was master of the Continent, England mistress of the seas.

—James MacGregor Burns

Yet he was sharp and self-interested enough (serving, that is, his demanding mistress, Painting) to write more than 400 letters …

—Ronald Pickvance

4

a

: a woman other than one's spouse with whom a married person has a continuing sexual relationship

b

archaic : sweetheart

5

a

—used archaically as a title prefixed to the name of a woman

b

chiefly Southern US and Midland US

—used as a conventional title of courtesy except when usage requires the substitution of a title of rank or an honorific or professional title before a married woman's surname : mrs. sense 1a

6

: an often professional dominatrix

With each addition of pain or restraint, he stiffens slightly, then falls into a deeper calm, a deeper peace, waiting to obey his mistress.

—Marianne Apostolides

Synonyms of mistress

• concubine
• lover

Examples of mistress in a Sentence

The dog was always obedient to its master and mistress.

the master and mistress of the house

a married man who has a mistress

His wife suspected that the woman she'd seen with him was his mistress.

Recent Examples on the Web

His most recent film, Ferrari, explicitly sees the title character trying to juggle his relationships with his wife and mistress alongside his passion for car racing. —Jesse Raub, The Atlantic, 15 Dec. 2025

Allen performed the popular track from her new album, West End Girl, which centers on the narrator confronting her husband’s mistress, named Madeline. —Carly Thomas, HollywoodReporter, 14 Dec. 2025

The alleged mistress of former Michigan football head coach Sherrone Moore received a massive pay bump between 2024 and 2025. —Amber Harding Outkick, FOXNews.com, 11 Dec. 2025

In May 1992, outside her Long Island home, Mary Jo (Chloe Lanier) was shot in the head by 17-year-old Amy Fisher (Maddy Hillis) — the mistress of her husband, Joey Buttafuoco (Dillon Casey). —Rosy Cordero, Deadline, 11 Dec. 2025

Word History

Etymology

Middle English maistresse, from Anglo-French mestresse, feminine of mestre master — more at master

First Known Use

14th century, in the meaning defined at sense 1

Phrases Containing mistress

• mistress of ceremonies

Rhymes for mistress

• headmistress
• postmistress
• schoolmistress

Kids Definition

mistress

noun

mis·​tress ˈmis-trəs 

1

: a woman who has control or authority like that of a master

the mistress of the household

2

: something considered as a female that rules or directs

3

: a woman to whom a man is not married and with whom he has a romantic relationship

4

—used formerly as a title before the name of a woman

Etymology

Middle English maistresse "mistress," from early French mestresse (same meaning), a feminine form of mestre "master" — related to master