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  1. Oxford American Dictionary

    dark reaction

    • IPA[därk rēˈakSHən]
    • n.
      the cycle of reactions (the Calvin cycle) which occurs in the second phase of photosynthesis and does not require the presence of light. It involves the fixation of carbon dioxide and its reduction to carbohydrate and the dissociation of water, using chemical energy stored in ATP.

    • noun: dark reaction, plural noun: dark reactions