1) Alchemical process 2) Chemical process 1) Vaporization 
In pre-modern chemistry and alchemy, cohobation was the process of repeated distillation of the same matter, with the liquid drawn from it; that liquid being poured again and again upon the matter left at the bottom of the vessel. Cohobation is a kind of circulation, only differing from it in this, that the liquid is drawn off in cohobation, as in...
• (n.) The process of cohobating.
Co`ho·ba'tion noun [ Confer French cohobation .] (Anc. Chem.) The process of cohobating. Grew.