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2.
In the world of BDSM practitioners, a 'Dominatrix' refers to a person who primarily offers sexual services - but with a BDSM element.

ie, a prostitute with a whip

not be confused with a pro-domme - who offers BDSM services for a fee, but not necessarily sexual services.
Gina, the Dominatrix, packed her condoms and whip and set out to meet her next client
by maple_carver June 11, 2010
 
1.
(n) 1. a woman who practices BDSM in everyday life; a woman who controls her partner mentally and physically, usually in a sexual way. Vanilla people categorize this type of lifestyle as kinky. The Dominatrix is stereotypically pictured as wearing stilleto boots, black leather outfit, and hold a whip.

2. a woman who gets paid to control a person, usually in a sexual way.

3. female counterpart of a Dom
The Dominatrix tied her slave to the bedpost and prepared to whip his ass.
by BlackGoddess December 11, 2003
 
3.
There may be a continental divide between the meanings of this word.

In the UK, within the 'real' BDSM scene, a Dominatrix is generally seen as a sexual role, with the BDSM aspect as a kinky additive
A Domme - or a Pro-Domme is more serious about the BDSM aspect and a 'real' Domme may not even offer actual sexual intercourse to those she dominates.

In the UK, 'Dominatrix' is often used as a term for a prostitute who carries a cane with her condoms

In the USA, the terms Dominatrix, Domme and Pro-Domme seem to be interchangeable

a man may refer to his dominating wife as a Dominatrix, and may use the same term for a woman who charges money to have sex with him, after spanking him.

Because so much US culture eventually makes it's way to the UK, I expect the various words Domme, Pro-Domme and Dominatrix to lose their subtle differences here, and simply become the same bland interchangeable titles that are in use in the USA
DuWayne: "My wife is a real Dominatrix"
Barry: "You mean you let her have sex with other guys?"
DuWayne: "What! No. Don't be so disgusting"
by DutchCappedCrusader January 19, 2014
 
4.
A dominant woman or TS that administers discipline, shows control.

A woman who physically and psychologically dominates and abuses her partner. Bondage, Discipline, Sado Masochisim.
Billy needs to be punished by his Dominatrix.
by Candie May 04, 2004
 
5.
a.k.a. Domina, Domme, Mistress, Alpha Girl, Toppette, W.H.A.P. (Woman Who Administers Pain), W.I.C. ('Wom(a/e)n In Command' or 'Wom(a/e)n In Control'), 'She Who Must be Obeyed'.

A Woman or Girl Who's discovered - or been made aware of a set of immutable truths which will create for Her a little patch of Heaven wherever She happens to be standing on this Hell called 'Earth' the rest of us inhabit.

These Truths are:

1.) A Woman desires the man She loves; a man loves the Woman he desires.
2.) Control the male libido, and you control the rest of him, too.
3.) Being addressed as 'Mistress' means NEVER having to say you're sorry.
4.) It is perfectly legal (in most states) for a Woman to charge a man $250.00 per hour (400 for 2 hehe) to make him crawl about on the end of a leash in Her basement and command him to yap like a Yorkie.
5.) REAL Women wear heels.

Since my Woman got those stiletto heels,
She whips me 'til I'm covered with weals.
A Dominatrix my Angel then became,
Taking my love, but repaying with pain.

~tfb~
by topsfrombottom May 17, 2006
 
6.
One mean bitch in bed.
I recently found out my mother was a dominatrix as I heard my father screaming from the bedroom.
by Chels. March 12, 2007
 
7.
Well, you see, sometimes there are businessmen who have to make lots of decisions during the week, so on the weekends they go to a woman who tells them exactly what she wants them to do ... with leather and whips.
3 o'clock: appointment with the Japanese ambassador. 4 o'clock: meeting with my dominatrix.
by Natalie Morgaine July 30, 2006