noun A single thickness of some material covering a surface.
Wrap the loaf in two layers of aluminum foil before putting it in the oven.
noun An item of clothing worn under or over another.
It's cold now but it will warm up this afternoon. Make sure you wear layers.
noun A (usually) horizontal deposit; a stratum.
I find seven-layer cake a bit too rich.
noun One of the items in a hierarchy.
mired in layers of deceit
noun One in a stack of (initially transparent) drawing surfaces that comprise an image; used to keep elements of an image separate so that they can be modified independently from one another.
noun One of the seven network switch pieces in the Open Systems Interconnection model: application, presentation, session, transport, network, data link, and physical.
noun An alternative keymap accessed through a modifier key or toggle.