process

https://doi.org/10.1351/goldbook.P04858
A phenomenon by which change takes place in a system. In physiological systems, a process may be chemical, physical or both.
Source:
PAC, 1992, 64, 1569. (Quantities and units for metabolic processes as a function of time (IUPAC Recommendations 1992)) on page 1572 [Terms] [Paper]