|  | 
Definition of Retroactive law
1. Noun. (legal) Any law that makes a prior legal act illegal, or increases the penalty for a prior illegal act. ¹
¹ Source: wiktionary.com
|  | 
1. Noun. (legal) Any law that makes a prior legal act illegal, or increases the penalty for a prior illegal act. ¹
¹ Source: wiktionary.com