Multiple sheets, levels, or thicknesses of material placed one on top of another, or distinct levels of organization.
From Middle English 'leyer', from 'lay' + suffix '-er'. Originally referred to something that lays or is laid down, evolving to describe stacked or stratified arrangements.
The Earth's atmosphere has distinct layers with poetic names like troposphere and stratosphere, each with unique characteristics. In computer science, 'layered architecture' mimics this natural pattern, with each software layer handling specific functions while building on those below.
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