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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."
Lambda by Baelnoren June 9, 2008
Urban Dictionary Merch
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
lambda by P6 July 7, 2006
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.
Lambda by Simba dlp November 15, 2010
Lambda refers to the common household pet. This pet is never to be named anything other than lambda. Lambdas can be cross bred between other animals such as unicorns. This particular breed is called a lambda corn. Other common crossbreeds are pamela anderson + lambda= pamlambda anderson. Lambdas are sold at a price of 300 yen or 600 yen when it is buy one lambda get on free.
Have you got your lambda yet?
Everyone is doing it!
lambda by R182 January 14, 2008
Being on the same wavelength; vibing with someone.
My best friend can finish all of my sentences. We’re on lambda.”
Lambda by virat1871 May 4, 2024
To vibe with someone or be on the same wavelength; used to describe people you’re connected with, such as having the same reaction to something or feeling the same way.
My best friend and I always know when we’re bluffing in poker - we’re completely on lambda.
Lambda by virat1871 May 19, 2024

Lambda Male 

Whatever thing Gordon Freeman is. Someone who's really quiet, but strong.
guy1: man'st thou heard 'bout guy3? he dostn't even speaketh!
guy2: strange character quality but ok. methinks he's Gordon Freeman in the flesh, or rather a Lambda Male.
Lambda Male by It's a stone Ruigi September 27, 2020
More from Urban Dictionary
In sales terms, a whale is a prospect that is significantly larger than an organization’s average customer.

Whales are large and extremely difficult to close. Due to their immense size, they are highly sought-after.

A whale is typically identified at first by a whale hunter on the sales team, but often requires cross-discipline participation in order to close; this includes assistance from operations, engineering, creative, client success, and business development teams.
"Shit...the sales director chewed me out on the sales call this morning. He's totally pissed that I have nothing in my pipeline. I've been focused on this one whale for so long that I haven't had time to prospect for normal-sized deals."
Whale by FQ_GFY February 3, 2020
Word of the Day on September 21, 2026
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