What is Convergence?

Convergence definition and meaning on Dictionary terms:
an act or instance of converging.
a convergent state or quality.
the degree or point at which lines, objects, etc., converge.
Ophthalmology. a coordinated turning of the eyes to bear upon a near point.
Physics. the contraction of a vector field. a measure of this.

Meteorology. a net flow of air into a given region.Compare divergence(def 2).

Biology. similarity of form or structure caused by environment rather than heredity.