lubrication

This term describes the reduction of friction through the introduction of a slippery medium. In mechanical engineering, it carries a connotation of maintenance and preservation, focusing on the prevention of heat buildup and material degradation in machinery. In biological contexts, the word refers to the natural secretion of fluids that allow tissues or joints to glide without damage. Because it describes a process or a state of being slippery, it is treated as an uncountable mass noun and does not take a plural form in standard usage.