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Short for "cisgender" (opposite of "transgender"), used to describe someone whose gender identity matches their anatomical gender at birth.

Occasionally used derogatorily.
Mark: I heard that Stacy decided to start her transition.

David: Huh? Dude, Stacy is cis. You mean her sister.
by captaincorduroy June 29, 2009
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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Short for cisgendered; referring to someone who identifies with the gender they were assigned at birth.
The opposite of Transgender would be Cisgender .
by Patchesthepirate March 12, 2017
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Commonwealth of Independent States; putative successor to the USSR, except that the Baltic Republics of Estonia, Latvia, and Lithuania never joined. Contrary to another definition of CIS at the Urban Dictionary, the CIS does not stand for "Communist Independent States." Moreover, that definition has the CIS existing BEFORE 1991, and includes Kazakhstan as "not officially part of the Soviet Union." Kazakhstan was, in fact, one of the 15 republics of the USSR until 1991.

The CIS came into being December 1991. Mostly consists of regularly scheduled conferences of foreign ministers and defense ministers.

In 1995, members Belarus and Russia created the Commonwealth of Sovereign Republics (CSR).
The August 2008 war between Georgia and Russia was unique in being a direct war between CIS member states, although there have been others waged by proxy.
by Killa Klown is wrong June 16, 2010
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Abbreviation for the Confederacy of Independant Systems. Second worst faction in the Star Wars universe beaten only by the wretched Alliance to Restore the Republic/New Republic as THE worst.
Seperatist movement! Ha! The seperatists are just a bunch of disgruntled corporate moguls who don't want their businesses infringed upon.
by Exor January 10, 2005
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Cisgender (opposite for transgender). People who like the gender they were born with.
Emma: Seriously, all these tumblr users using a bunch of wierd words... Like what is ''cis''?
Veronica: Cis means liking your gender you were born with, I am cis. I was born a girl and I like being a girl.
by SirahHuxley July 13, 2015
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(1) Citizenship and Immigration Services; the successor to the investigations and processing arm of the former Immigration and Naturalization Services (INS) of the USA. In 2003, the INS was dissolved and its enforcement arm transferred to the new Immigration and Customs Enforcement (ICE). The INS had formerly been part of the Justice Department; the CIS is part of the Department of Homeland Security (DHS).

(2) Center for Immigration Studies, a thinktank founded by John Tanton as a project of FAIR. The Southern Poverty Law Center (SPLC) lists the CIS as a racist nativist organization with extensive connections with other rightwing organizations.
(DEF1) She spent the better part of a week struggling through the CIS website, trying to imagine how anyone could get a work permit without violating the laws of physics.

(DEF2) Some at CIS have also written for a nativist hate site, VDARE.com, which is named after Virginia Dare, said to be the first English child born in the New World. They include CIS Fellow John Miano and board member Carol Iannone.
(Heidi Beirich, "CIS: The 'Independent' Think Tank," Feb 2009)
by Primus Intra Pares June 16, 2010
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