Term: uphill transport https://doi.org/10.1351/goldbook.UT06884 Definition: Process in which diffusion of a component occurs from a less concentrated stream to a more concentrated permeable stream. Related Terms: 1) diffusion (http://doi.org/10.1351/goldbook.D01716). Source: PAC, 1996, 68, 1479. 'Terminology for membranes and membrane processes (IUPAC Recommendations 1996)' on page 1486 (https://doi.org/10.1351/pac199668071479) Citation: 'uphill transport' 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.UT06884 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.