Legal Definitions - unessential mistake

An unessential mistake is an error or misunderstanding that does not affect the nature of the contents of an agreement, but only relates to some external circumstance. This type of mistake has no effect on the validity of the agreement.

For example, if two parties agree to sell a car for $10,000, but later discover that the car has a scratch on the bumper, this would be considered an unessential mistake. The scratch does not affect the nature of the agreement to sell the car for $10,000, and therefore does not invalidate the agreement.

Another example of an unessential mistake could be a typographical error in a contract that does not affect the meaning or intent of the agreement.

Overall, an unessential mistake is a mistake that does not have a significant impact on the agreement and does not affect its validity.