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An Idea backing up or dissing another idea
Galileo had a lemma about the earth being at the center of the universe
Lemma by $†?vø April 1, 2008
When you have a situation for which there is only one choice, that you have to do. You don't really want to do it, but there's no choice.

As opposed to a dilemma when you have two choices for a situation.
"Last night I had to go see the 12:01 showing of Green Hornet. The only time I could see it. I didn't want to, but I had to. Eh, I'm in a real lemma." Ben Mankiewicz, the What the Flick?! movie review show
lemma by QuestionMarc January 16, 2011
Derogatory slang referring to a mentally handicapped person.
That lemma thought he could make his computer go faster by switching the voltage to 220.
Lemma by Bob Farmer August 30, 2007
Part of a mathematical proof that draws too much attention so readers have much more difficulty in understanding the whole thing than before.
Teacher: "We shall use Itô's lemma to study stochastic calculus...Oh! Sorry, should be the other way around!"
Lemma by Don Schumland March 21, 2021
(noun) A slang word that is used when talking about an issue, problem, or dilemma, but don't want to use a word as harsh. The meaning is similar, but the connotation is lighter.

This word is similar to "dilemma", but is not derived from that word.
Ron: "I have an issue."
Sam: "Do you know the solution?"
Ron: "Yes."
Sam: "So... what's the lemma?"
Lemma by antiSulfurOxygenHam November 28, 2024

Adihaya Jayasharmaramankumarguptareddybavarajugopal lemma 

A very great technique for solving math problems. Often only works because they solved it in a different way and used this lemma in a way that gives the same answer as the other way.
-How did you solve this problem?

-I used the Adihaya Jayasharmaramankumarguptareddybavarajugopal lemma