What is define tangential?

Tangential refers to something that is related to or touching something else at a single point or along a line. In mathematics, the term tangential is used to describe a line or plane that touches a curve or surface at a single point without crossing it. In physics, tangential force is the force acting on an object tangent to its surface. In business, tangential thinking refers to a type of thinking that explores ideas and concepts that are not immediately related to the main topic but may be tangentially related. In general, the term tangential implies that something is touching or connected in a secondary or incidental way.