A symbol in the greek alphabet.

In physics, represents nuclear half life, or the wavelength of a ray/photon/light.

Used in the Half-Life games as the symbol for the rebellion. Also represents the game in general.
"C (The Speed of Light) equals Lambda (wavelength) times F (frequency)."

"Follow the lambdas spray-painted on the walls to a secret weapons cache."
by Baelnoren June 9, 2008
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term used to describe the gay, bisexual, lesbian, transgendered, and progressive subculture; term used to describe the gay civil rights movement.
I am a member of the lambda community.
by Simba dlp November 11, 2010
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The nerd fraternity from "Revenge of the Nerds". At all of its other chapters, however, it's a black fraternity. Called "Tri-Lamb" for short.
"You guys wanna go to the Tri-Lamb party tonight?"
"No, I'd rather go pimp it over at Lane Bryant. There'll be hotter girls there."
by Nick D May 14, 2004
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A group of men, usually of Asian decent, with abnormally large penii, found grouped together at your local Asian-American gatherings, picking up all the women and making other men envious of their penii.
"Wow, look at those Lambdas, they have abnormally large penii."

"Ow, that Lambda made me bleed last night."

"That Lambda's thing was so big, I couldn't put my mouth around it."
by small asian woman October 15, 2007
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The radioactive decay constant. Symbol for nuclear half life.

Like the rainbow, the lambda is yet another cool symbol stolen by the gay community.
guy: Hey did you see my cool counterstrike sticker I put on my car?!? Its a lambda!
friend: HAHAHAHA!!! YOUR GAY! ROFL!!1
by P6 July 7, 2006
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Originally- name of the fake fraternity from the movie "Revenge of the Nerds."
Became real in 2006 at UCONN, as a co-ed fake fraternity/social organization. There are currently 5 chapters at schools throughout the US.
Wanna rush Lambda Lambda Lambda?
Not unless we're NERDS!
by BroKaty May 1, 2014
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La Unidad Latina, Lambda Upsilon Lambda Fraternity, Incorporated was established on February 19, 1982 in order to address the shortcomings of academic institutions in meeting and addressing the needs of Latino students in higher education. Founded at Cornell University in Ithaca, New York, La Unidad Latina, Lambda Upsilon Lambda Fraternity, Incorporated primarily seeks to take a leadership role in meeting the needs of the Latino community through cultural awareness, community service, and promotion of the Latino culture and people.
La Unidad Latina, Lambda Upsilon Lambda Fraternity, Inc:
Not the first nor largest Latino Fraternity, but by far the best. UPSIIIIIIIIIIII - IIIIIILON
by Alpha Epsilon Chapter October 15, 2007
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