What it means

1. noun the property of partial coincidence in time
2. noun a representation of common ground between theories or phenomena
   “there was no overlap between their proposals”
3. noun a flap that lies over another part
   “the lap of the shingles should be at least ten inches”
4. verb coincide partially or wholly
   “Our vacations overlap”
5. verb extend over and cover a part of
   “The roofs of the houses overlap in this crowded city”