(1) To resize a device, object or system, making it larger or smaller. With regard to increases, "scale vertically" or "scale up" refers to expanding a single machine's capability. To "scale horizontally" or "scale out" refers to adding more machines.
With regard to decreases, the term is often used with cutting-edge chip technologies. For example, "this memory scales with CMOS" means that this memory architecture can take advantage of the advances in CMOS chip fabrication by becoming smaller as well. See upconvert and scalable.
(2) To expand. The term is widely used to refer to systems that easily expand. See scalable and scaler.
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