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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. The rubbing of one object or surface against another.
  2. n. Conflict, as between persons having dissimilar ideas or interests; clash.
  3. n. Physics A force that resists the relative motion or tendency to such motion of two bodies in contact.

Century Dictionary and Cyclopedia

  1. n. The rubbing of the surface of one body against that of another; attrition; frication.
  2. n. In mech., the resistance to the relative motion, sliding or rolling, of surfaces of bodies in contact: called in the former case sliding, in the latter rolling friction. It is partly due to the adhesion of bodies, but the greater part of it is the result of their roughness. The friction proper is independent of the velocity and of the area of contact; it depends solely upon the nature of the two surfaces and upon the pressure upon them, to which it is directly proportional. What is sometimes called the internal friction of fluids is vi scosity (which see). The friction of a fluid upon a solid is considerable; it is now recognized as an important factor in the designing of ships.
  3. n. Figuratively, lack of harmony; mutual irritation; worrying; difficulty.

Wiktionary

  1. n. The rubbing of one object or surface against another.
  2. n. Conflict, as between persons having dissimilar ideas or interests; clash.
  3. n. physics : A force that resists the relative motion or tendency to such motion of two bodies in contact.

GNU Webster's 1913

  1. n. The act of rubbing the surface of one body against that of another; attrition; in hygiene, the act of rubbing the body with the hand, with flannel, or with a brush etc., to excite the skin to healthy action.
  2. n. (Mech.) The resistance which a body meets with from the surface on which it moves. It may be resistance to sliding motion, or to rolling motion.
  3. n. A clashing between two persons or parties in opinions or work; a disagreement tending to prevent or retard progress.

WordNet 3.0

  1. n. effort expended in moving one object over another with pressure
  2. n. the resistance encountered when one body is moved in contact with another
  3. n. a state of conflict between persons

Etymologies

  1. From Middle French friction and directly from Latin frictionem, nom. frictio ("a rubbing, rubbing down") (Wiktionary)
  2. Latin frictiō, frictiōn-, from frictus, past participle of fricāre, to rub. (American Heritage® Dictionary of the English Language, Fourth Edition)

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‘friction’ has been looked up 2060 times, loved by 1 person, added to 10 lists, and has a Scrabble score of 13.