: the process of nucleating or clustering
the nucleation of communities in villages and cities — A.J.Bruwer
as
a. : the formation of nuclei (as in a supersaturated vapor or the free air)
kept a continuous record of atmospheric nucleation for several years — Science
b. : the action of a nucleus in starting a process (as condensation, crystallization, or precipitation)
pearlitic structure … is formed by a process of nucleation and growth — Frederick Seitz
c. : the process of seeding a cloud for the production of rain
Useful english dictionary. 2012.