In logic, a form of syllogism where the conclusion reverses or negates what would normally follow from the premises.
From dis- (reversal) + amis (possibly related to Latin amicus or a logical term). This is a technical term in formal logic with somewhat obscure etymology.
This is an incredibly obscure logical term—even philosophy students rarely use it! It represents a way of structuring arguments that seems to go against normal logical expectations, which is probably why it has 'dis-' in its name.
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