Using or controlling something's power or resources for a specific purpose, like harnessing wind energy or harnessing anger into motivation.
From 'harness' (Old French 'harnois'), originally meaning armor or equipment. It evolved to mean putting equipment on a horse, then metaphorically to mean controlling or directing power.
The word perfectly captures why we use almost the same metaphor today: just as medieval knights 'harnessed' horses with equipment to multiply their power, we 'harness' electricity and ideas the same way.
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