eve in WordNet English dictionary

1. the latter part of the day (the period of decreasing daylight from late afternoon until nightfall)
   "he enjoyed the evening light across the lake"
   evening  eve  even  eventide 
   
2. the day before
   "he always arrives on the eve of her departure"
   eve 
   
3. the period immediately before something
   "on the eve of the French Revolution"
   eve