Dictionary

mistress

noun mis·tress \ˈmis-trəs\

Definition of MISTRESS

1
:  a woman who has power, authority, or ownership: as
a :  the female head of a household
b :  a woman who employs or supervises servants
c :  a woman who is in charge of a school or other establishment
d :  a woman of the Scottish nobility having a status comparable to that of a master
2
a chiefly British :  a female teacher or tutor
b :  a woman who has achieved mastery in some field
3
:  something personified as female that rules, directs, or dominates <when Rome was mistress of the world>
4
a :  a woman other than his wife with whom a married man has a continuing sexual relationship
b archaic :  sweetheart
5
a —used archaically as a title prefixed to the name of a married or unmarried woman
b chiefly Southern & Midland :  mrs. 1a
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Origin of MISTRESS

Middle English maistresse, from Anglo-French mestresse, feminine of mestre master — more at master
First Known Use: 14th century
MISTRESS Defined for Kids

mistress

noun mis·tress \ˈmi-strəs\

Definition of MISTRESS for Kids

1
:  a female teacher
2
:  a woman who has control or authority over another person, an animal, or a thing <… the old woman had no loyalty toward her mistress … — Esther Forbes, Johnny Tremain>

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