Osculate
# Osculate

In mathematics, osculate, meaning to touch (from the Latin osculum meaning kiss), may refer to:

* osculant, an invariant of hypersurfaces
* osculating circle
* osculating curve
* osculating plane
* osculating orbit
* osculating sphere

The obsolete Quinarian system of biological classification attempted to group creatures into circles which could touch or overlap with adjacent circles, a phenomenon called 'osculation'.

