an improvement, usually a small one, to something:
The new model has a number of refinements.
something which is an improved version of an existing product, system etc
The new theory is a refinement of Corbin's theory of personality development.
the process of improving something:
Some further refinement is needed.
the process of making a substance more pure:
the refinement of cocaine
the quality of being polite and well-educated, in a way that is typical of someone from a high social class:
a woman of great refinement