It comes from the Latin aequus which means fair, but really it means *even* or *balanced*. If you have *equity* in your house, then that means you have value in it fair to its price. You owe the bank $100,000, the house is worth $400,000, your equity (or balance, evenness, etc) is $300,000.
There is a similar sounding Latin word, equus, which is the genus that includes horses. We just stole that from the Latin language. It is why equine and equity mean different things but they look like they should be the same.
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