overlap in WordNet English dictionary

1. a representation of common ground between theories or phenomena
   "there was no overlap between their proposals"
   overlap  convergence  intersection 
   
2. a flap that lies over another part
   "the lap of the shingles should be at least ten inches"
   lap  overlap 
   
3. the property of partial coincidence in time
   overlap 
   

1. extend over and cover a part of
   "The roofs of the houses overlap in this crowded city"
   overlap 
   
2. coincide partially or wholly
   "Our vacations overlap"
   overlap