epiphenomenon

/ˌɛpɪfəˈnɑməˌnɑn/
noun
  1. A secondary effect or by-product that occurs alongside a main event or process but does not influence it.
    • The increase in tourism was an epiphenomenon of the new highway, not the reason it was built.
    • Some philosophers view emotions as an epiphenomenon of brain activity, without a direct role in decision-making.
    • The scientist considered the color change an epiphenomenon of the chemical reaction, not part of the main process.
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