A more thorough explanation:

Definition: Confirmatio perficiens is a Latin term that means "perfecting confirmation." It refers to a type of confirmation that validates a wrongful and defeasible title or makes a conditional estate absolute.

For example, if a person has a title to a property that was obtained through fraud or mistake, a confirmatio perficiens can be used to ratify the title and make it valid. Similarly, if a person has a conditional estate that is subject to certain conditions, a confirmatio perficiens can be used to make the estate absolute and remove the conditions.

Overall, confirmatio perficiens is a legal tool that can be used to perfect or validate a title or estate that would otherwise be defective or conditional.