n.1 the action of one object rubbing against another.
2 the resistance an object encounters in moving over another.
3 a clash of wills, temperaments, or opinions; mutual animosity arising from disagreement.
4 (in comb.) of devices that transmit motion by frictional contact (friction-clutch; friction-disc).
Phrases and idioms:
friction-ball a ball used in bearings to lessen friction.
Derivatives:
frictional adj. frictionless adj.
Etymology: F f. L frictio -onis f. fricare frict- rub