kontakthõõrdumine tingimustes, kus hõõrduvaid pindu eraldab piisava paksusega (üle 0,1 µm) katkematu määrdekiht (vrd hüdrodünaamiline määrimine), a state of perfect lubrication in which the bearing surfaces are completely separated by a fluid or viscous oil film which is induced and sustained by the relative motion of the surfaces (compare: hydrodynamic lubrication)