before before /ˌbiːˈfɔr/

adverb

1. () Earlier in time; previously  ( earlier , before )
   earlier in time; previously
    I had known her before
   I had known her before
    As I said before
   as I said before
    He called me the day before but your call had come even earlier
   he called me the day before but your call had come even earlier
    Her parents had died four years earlier
   her parents had died four years earlier
    I mentioned that problem earlier
   I mentioned that problem earlier
   
2. At or in the front  ( before , ahead , in front )
   at or in the front
    I see the lights of a town ahead
   I see the lights of a town ahead
    The road ahead is foggy
   the road ahead is foggy
    Staring straight ahead
   staring straight ahead
    We couldn't see over the heads of the people in front
   we couldn't see over the heads of the people in front
    With the cross of Jesus marching on before
   with the cross of Jesus marching on before
   

conjunction

1. () Earlier in time than  ( before , ere )
   earlier in time than
   

preposition

1. () Earlier in time or order than a specified moment or event.  ( before )
   Earlier in time or order than a specified moment or event.
   
2. () Positioned in front of; within one's view or attention.  ( before )
   Positioned in front of; within one's view or attention.