The retrieval of something is the process of getting it back from a particular place, especially from a place where it should not be. Its real purpose is the launching and retrieval of small aeroplanes in flight. = recovery
A retrieval is a request for information that has been issued by an acquirer because a card issuer has disputed a transaction that has been entered into with one of their cardholders It is not a chargeback as no money has been debited
the cognitive operation of accessing information in memory; "my retrieval of people's names is very poor" (computer science) the operation of accessing information from the computer's memory
The activity of finding and making available records or record information to the creating administrative units or other researchers Retrieval is a part of the reference service provided by the staff of the University Archives