(1):
(n.) 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.
(2):
(n.) The lapping of one thing over another; as, an overlap of six inches; an overlap of a slate on a roof.
(3):
(v. t. & i.) To lap over; to lap.