Friction

Antonyms of friction:
concurrence, cooperation, accord, agreement, concord, concordance, harmony, peace.
Examples of usage:
  1. On account of the friction.
    "The Wonder Island Boys: Exploring the Island", Roger Thompson Finlay.
  2. But with another week, Rowland said to himself, it would leap erect again; the lightest friction would strike a spark from it.
    "Roderick Hudson", Henry James.
  3. Mr. Lincoln undoubtedly hoped thus to avoid unnecessary friction.
    "History-of-the-Impeachment-of-Andrew-Johnson-President-of-the-United-States-by-the-House-of-Representatives-and-his-trial-by-the-Senate-for-high-crimes-and-misdemeanors-in-office-1868", Ross, Edmund G. (Edmund Gibson).