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  • A substance that speeds up a chemical reaction without being consumed itself in the reaction.
  • A substance that alters (usually increases) the rate at which a reaction occurs.
  • a substance that accelerates a chemical reaction but does not become a part of the product produced
    Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
  • A substance that promotes a chemical reaction by lowering the activation energy of a chemical reaction, but which itself remains unaltered at the end of the reaction.