Component
Pure metal or compound (e.g., Cu, Zn in Cu-Zn alloy, sugar, water, in syrup.)
Solvent
Host or major component in solution.
Solute
Dissolved, minor component in solution.
System
Set of possible alloys from same component (e.g., iron-carbon system.)
Solubility Limit
Maximum solute concentration that can be dissolved at a given temperature.
Phase
Part with homogeneous physical and chemical characteristics