osculation

1. (mathematics) a contact of two curves (or two surfaces) at which they have a common tangent (synset 114443293)
   referred to in: math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
   is a type of: contact - the state or condition of touching or of being in immediate proximity
2. The act of caressing with the lips (or an instance thereof) (synset 100139041)
   is a type of: touch, touching - the act of putting two things together with no space between them
   subtypes:

   • smack, smooch - an enthusiastic kiss
   • deep kiss, french kiss, soul kiss - an openmouthed kiss in which your tongue is inserted into the other's mouth
   same as: buss, kiss

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