Wiktionary
prior to
prep. (context formal English) before
Usage examples of "prior to".
The coroner had determined that the woman had died first, though there was no way of knowing what might have taken place before her very eyes prior to her death.
Dahl had been in the Haas home, that he had been there that day, that an eyewitness had seen him enter the house, that he had left a fingerprint on the telephone, that a neighbor had made a complaint about him to the police just days prior to the murders.