Definitions from Wiktionary (Layer)

▸ noun:  A single thickness of some material covering a surface.
▸ noun:  An item of clothing worn under or over another.
▸ noun:  A (usually) horizontal deposit; a stratum.
▸ noun:  One of the items in a hierarchy.
▸ noun:  (computer graphics, by analogy to a stack of transparencies) 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:  (networking) One of the seven network switch pieces in the Open Systems Interconnection model: application, presentation, session, transport, network, data link, and physical.
▸ noun:  (computing) An alternative keymap accessed through a modifier key or toggle.
▸ verb:  (ambitransitive) To cut or divide into layers.
▸ verb:  (ambitransitive) To arrange in layers.
▸ noun:  A person who lays anything, such as tiles or a wager.
▸ noun:  A mature female bird, insect, etc. that is able to lay eggs.
▸ noun:  A hen kept to lay eggs; a breed of chicken bred to maximize laying output.
▸ noun:  A shoot of a plant, laid underground for growth.
▸ noun:  A surname.

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