Term: molecular conformation https://doi.org/10.1351/goldbook.M03984 Definition: The conformation of the macromolecule as a whole. In the polymer literature, molecular conformation is sometimes referred to as macroconformation. In molecular conformations involving parallel stems, the latter may be confined to the same crystal or may also extend over several crystals. Related Terms: 1) conformation (http://doi.org/10.1351/goldbook.C01258). 2) macromolecule (http://doi.org/10.1351/goldbook.M03667). Source: Purple Book, 1st ed., p. 77 (http://old.iupac.org/publications/books/author/metanomski.html) Citation: 'molecular conformation' 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.M03984 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.