lubrication

noun

process of reducing friction
act or process of applying lubricant, making slippery

Wiktionary

Pronunciation: /ˌluː.bɹɪˈkeɪ.ʃən/

noun

Etymology: Etymology tree English lubricate Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin -ātiōlbor. Old French -ationbor. Middle English -acioun English -ation English -ion English lubrication From lubricate + -ion.

The application of a substance (lubricant) between moving surfaces in contact in order to reduce friction and minimize heating.
“Valve and cylinder lubrication is by atomised oil delivered by mechanical lubricators.”