Assumption

An assumption is an unstated piece the argument needs in order to work. The author never says it, but the argument falls apart without it. Every LSAT argument has at least one.

Example

"The course filled up, so I will not get in" assumes no seats will open up before the term starts.

See also

• Necessary Assumption
• Sufficient Assumption
• Flaw in the Reasoning

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Last updated October 12, 2026