Is it ensure, insure, or assure?
nucleation nu·cle·a·tion (nōō'klē-ā'shən, nyōō'-)
The beginning of chemical or physical changes at discrete points in a system, such as the formation of crystals in a liquid.
The formation of cell nuclei.
nucleate nu·cle·ate (nōō'klē-āt', -ĭt, nyōō'-)
Nucleated. v. nu·cle·at·ed, nu·cle·at·ing, nu·cle·ates (-āt')
To form into a nucleus.
To serve or act as a nucleus for.
To provide a nucleus for.
the initial process that occurs in the formation of a crystal from a solution, a liquid, or a vapour, in which a small number of ions, atoms, or molecules become arranged in a pattern characteristic of a crystalline solid, forming a site upon which additional particles are deposited as the crystal grows.