The terminology which best describes the solution before the crystal was added is: supersaturated.
Dissolution can be defined as the process which involves dissolving (dissociating) a solute in either solid, liquid or gaseous phase into fragmented particles by a solvent in order to form a solution.
A supersaturated solution refers to a solution that contains more solute than the equilibrium amount. Thus, it typically occurs when a solution of a given sample is in dynamic equilibrium with the dissolved solute.
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