When did "stack" became synonymous with an instance of an effect? e.g. "Three stacks of vulnerability"
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This might be a bit of a crossover question with linguistics. "Stacking" itself is a rather old concept, but referring to instances of buff/debuff as a "stack" seems to have appeared later.
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Huawei S Series Switches Stacking Feature Introduction
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
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