prioradjective(EARLIER)
Thesaurus: synonyms, antonyms, and examples before something
beforeTry to arrive before the start of the meeting.
prior toAll utensils should be washed prior to use.
in advance ofCall in advance of your visit to see if you'll need a parking reservation.
ahead ofMy sister is arriving ahead of me to do the shopping for the dinner.
byMake sure you're back by midnight.