Perfect instrument
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
An instrument such as a deed or mortgage is said to become perfect when recorded (or registered) or filed for record, because it then becomes good as to nil the world. See Wilkins v. McCorkle, 112 Tenn. 688, 80 S. W. 834.
Defined under Perfect in Black's Law Dictionary.