That's not the definition of insanity. Common misconception though.
noun, plural insanities.
1.
the condition of being insane; a derangement of the mind.
Synonyms: dementia, lunacy, madness, craziness, mania, aberration.
2.
Law. such unsoundness of mind as frees one from legal responsibility, as for committing a crime, or as signals one's lack of legal capacity, as for entering into a contractual agreement.
English
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I know it's not. It's a cliche and a well known quote. I said so right in the first paragraph.
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He's referring to Einstein's definition.
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Actually Einstein never said that. It's a misattribution.
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For real? How did that happen? Who actually said it?
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Einstein wasn't the first to say this, another misconception. Apparently when a quote is put by someone's picture online, it's fact.