osculation

noun

1. the act of kissing.
2. a kiss.
3. close contact.
4. Geometry. the contact between two osculating curves or the like.

noun

1. Also called: tacnode maths a point at which two branches of a curve have a common tangent, each branch extending in both directions of the tangent
2. rare the act or an instance of kissing

n.“kissing; a kiss,” 1650s, from Latin osculationem (nominative osculatio), noun of action from past participle stem of osculari (see osculate).