osculation

/ˌɑskjəˈleɪʃən/
noun
  1. The act of kissing.
    • In some cultures, a public osculation is considered inappropriate.
    • The painting depicted a romantic osculation between two lovers.
    • The couple shared a tender osculation under the moonlight.
  2. A close contact or touching, especially of two curves or surfaces.
    • In geometry, osculation describes where two curves touch each other.
    • The engineer studied the osculation of the two gears to ensure smooth rotation.
    • The osculation of the circles was so precise that they appeared to merge.