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The mathematical equivalent of a subroutine in a computer program—it makes an otherwise long or unwieldy math proof easier to read if it breaks up into smaller parts.
A mathematician's common dilemma in using a lemma is to decide where to place it in a math proof: should it be before, during, or after the proof?
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by MathPlus June 26, 2017
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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
by QuestionMarc January 15, 2011
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Derogatory slang referring to a mentally handicapped person.
That lemma thought he could make his computer go faster by switching the voltage to 220.
by Bob Farmer August 24, 2007
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