purification
n. C / U B2 Upper Intermediate US //ˌpjʊɹəfəˈkeɪʃən// UK //pjˌʊɹɪfɪkˈeɪʃən// pu·rifi·ca·tion
n. the process of removing dirty or harmful things from something to make it clean and pure.
n. the removal of contaminants or impurities from a substance or environment. Often describes chemical, industrial, or spiritual processes.
The city needs a new water purification system.
The purification of the local river took several years of strict environmental regulation and community effort.
Advanced filtration techniques allow for the purification of industrial wastewater to a degree that it can be safely reintroduced into the local ecosystem without harming aquatic life.
From Old French purificacion, from Latin pūrificātiō.
Usage
Uncountable when referring to the general process; countable when referring to a specific instance or method.