Nucleation refers to the process of forming or creating the initial stage or center of something. It is like the starting point or seed from which something develops or grows. Full definition
Typical temperature - supersaturation regions can be identified for the «onset» of ice nucleation of these different particle types, but the various particle sizes and activated fractions reported in different studies have to be taken into account when comparing results obtained with different methodologies. (geoengineeringwatch.org)
As the chemical ice nucleation process progresses, a shallow cold dense layer of air is eventually created at the ground level. (geoengineeringwatch.org)
As the atoms move around in the supercooled state in search for nucleation sites, the temperature continues to drop. (sciencedaily.com)