re|triev|al [rıˈtri:vəl] n [U]
1.) technical the process of getting back information stored on a computer system
a new system that should speed up information retrieval
2.) the act of getting back something you have lost or left somewhere
3.) be beyond/past retrieval
if a situation is beyond retrieval, it has become so bad that it cannot be made right again

Dictionary of contemporary English. 2013.