Diffusometry is a term that is used to describe the measurement and analysis of molecular diffusion. There are a few different synonyms that can be used to refer to this concept, including diffusion measurement, diffusion analysis, and diffusion profiling. Additionally, some researchers may use more specific terminology, such as pulsed gradient spin echo (PGSE) NMR diffusometry or fluorescence correlation spectroscopy (FCS) diffusometry, depending on the specific techniques and instruments that they are using. Regardless of the exact terminology used, diffusometry plays an important role in a wide range of scientific investigations, from the study of biological membranes and polymers to the development of new materials and drugs.