[n] a flap that lies over another part; "the lap of the shingles should be at least ten inches"
[n] the property of partial coincidence in time
[n] a representation of common ground between theories or phenomena; "there was no overlap between their proposals"
[v] concur partially or wholly; "Our vacations overlap"
[v] coincide partially
[v] extend over and cover a part of; "The roofs of the houses overlap in this crowded city"
[v] have something in common
agree, check, coincide, coincide, coincidence, concur, concurrence, conjunction, cooccur, co-occurrence, correspond, cover, crossroads, cuff, extend, fit, flap, gibe, hem, imbricate, interface, internal representation, jibe, lapel, lappet, match, mental representation, representation, share, tally, turnup
\O`ver*lap"\, v. t. & i. To lap over; to lap.
1. The lapping of one thing over another; as, an overlap of six inches; an overlap of a slate on a roof.
2. (Geol.) An extension of geological beds above and beyond others, as in a conformable series of beds, when the upper beds extend over a wider space than the lower, either in one or in all directions.