How do you spell Overlay

Available Definitions:
1)  v. t. - To lay, or spread, something over or across; hence, to cover; to overwhelm; to press excessively upon.
2)  v. t. - To smother with a close covering, or by lying upon.
3)  v. t. - To put an overlay on.
4)  n. - A covering.
5)  n. - A piece of paper pasted upon the tympan sheet to improve the impression by making it stronger at a particular place.