Term: induction https://doi.org/10.1351/goldbook.I03018 Definition: An increase in the rate of synthesis of an (inducible) enzyme in response to the action of an inducer or environmental conditions. An inducer is often the substrate of the inducible enzyme or a structurally similar substance (gratuitous inducer) that is not metabolized. Related Terms: 1) enzyme (http://doi.org/10.1351/goldbook.E02159). 2) inducer (<em>in enzyme catalysis</em>) (http://doi.org/10.1351/goldbook.I03017). Source: Citation: 'induction' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.I03018 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.