Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

  • 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.
  • n. 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.
  • n. A clashing between two persons or parties in opinions or work; a disagreement tending to prevent or retard progress.

from The Century Dictionary and Cyclopedia

  • n. The rubbing of the surface of one body against that of another; attrition; frication.
  • 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.
  • n. Figuratively, lack of harmony; mutual irritation; worrying; difficulty.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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

Etymologies

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

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