- 1[uncountable] the action of one object or surface moving against another Friction between moving parts had caused the engine to overheat.
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- 2[uncountable] (physics) the resistance (= the force that stops something moving) of one surface to another surface or substance moving over or through it The force of friction slows the spacecraft down as it re-enters the earth's atmosphere.
- 3[uncountable, countable] friction (between A and B) disagreement or a lack of friendship among people who have different opinions about something synonym tension conflicts and frictions that have still to be resolved
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