/rɛtrəˈspɛktɪv/ – adjective
Definition: có hiệu lực trở về trước, có hiệu lực hồi tố.
A more thorough explanation: In legal terms, “retrospective” refers to something that applies to events that have already occurred, or to actions that are taken with respect to past events. It can also refer to a law or regulation that is applied to events that occurred before the law or regulation was enacted.
Example: In retrospect, the company realized that they should have conducted a more thorough background check on the employee before hiring them.