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Definition of layer
1a sheet, quantity, or thickness of material, typically one of several, covering a surface or body:bears depend on a layer of blubber to keep them warm in the water figurativea larger missile would provide a layer of defense at higher altitudes a level of seniority in the hierarchy of an organization:a managerial layer 2 [in combination] a person or thing that lays something:the worms are prolific egg-layers 3a shoot fastened down to take root while attached to the parent plant.
verb [with object] (often as adjective layered)
1arrange in a layer or layers:the current trend for layered clothes cut (hair) in overlapping layers:her layered, shoulder-length hair 2propagate (a plant) as a layer:a layered shoot