What is the meaning of absorption?

noun

• Chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid.
  • synonyms: soaking up
• Physics) the process in which incident radiated energy is retained without reflection or transmission on passing through a medium. (
  • usage: "the absorption of photons by atoms or molecules"
• The social process of absorbing one cultural group into harmony with another.
  • synonyms: assimilation
• The process of absorbing nutrients into the body after digestion.
  • synonyms: assimilation
• Complete attention; intense mental effort.
  • synonyms: concentration, engrossment, immersion
• The mental state of being preoccupied by something.
  • synonyms: preoccupation, preoccupancy, engrossment