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Webster's Dictionary (1865)

ŏs'cu-lā'tion, n.

noun

n. [Lat. osculatio, a kissing, Fr. osculation, It. osculazione.]

  1. The act of kissing; a kissing.
  2. (Geom.) The contact of one curve with another, when at the point of contact they both have the same curvature for the greatest number of consecutive points in common.