osculation

Osculation means kissing. If you tease your friends with a rhyme that describes them "sitting in a tree/k-i-s-s-i-n-g," you're joking about osculation.

Most wedding ceremonies traditionally end with osculation, and osculation is also part of a typical greeting in many parts of Europe. It's a fancy way of saying "kiss," and if you think it sounds vaguely mathematical, you're right. Osculation is also a term in geometry that describes the place where two curves or surfaces come into contact, or where their common tangent exists. It's almost as if the two curved lines are kissing.

Definitions of osculation
  1. noun
    the act of caressing with the lips (or an instance thereof)
    synonyms: buss, kiss
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    types:
    smack, smooch
    an enthusiastic kiss
    French kiss, deep kiss, soul kiss
    an openmouthed kiss in which your tongue is inserted into the other's mouth
    smacker
    a loud kiss
    type of:
    touch, touching
    the act of putting two things together with no space between them
  2. noun
    (mathematics) a contact of two curves (or two surfaces) at which they have a common tangent
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    type of:
    contact
    the state or condition of touching or of being in immediate proximity
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