What is the meaning of refining?

noun

• The process of removing impurities (as from oil or metals or sugar etc..
  • synonyms: refinement, purification

verb

• Improve or perfect by pruning or polishing.
  • usage: "refine one's style of writing"
  • synonyms: polish, refine, fine-tune, down
• Make more complex, intricate, or richer.
  • usage: "refine a design or pattern"
  • synonyms: complicate, refine, rarify, elaborate
• Treat or prepare so as to put in a usable condition.
  • usage: "refine paper stock"; "refine pig iron"; "refine oil"
  • synonyms: refine
• Reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities.
  • usage: "refine sugar"
  • synonyms: refine, rectify
• Attenuate or reduce in vigor, strength, or validity by polishing or purifying.
  • usage: "many valuable nutrients are refined out of the foods in our modern diet"
  • synonyms: refine
• Make more precise or increase the discriminatory powers of.
  • usage: "refine a method of analysis"; "refine the constant in the equation"
  • synonyms: refine