Other forms: lubrications
When you grease the surface of something to make it move more smoothly and work better, you use lubrication. A bolt that's rusted in place might need some lubrication before being turned with a wrench.
Friction can keep motors from running, screws from budging, and bicycle wheels from turning properly — lubrication is a technique you can use to reduce friction. Lubrication involves the use of a lubricant, a slippery or greasy substance that eases the resistance of the two surfaces. The Latin root of lubrication is lubricus, or "slippery."