1. To include so that it no longer has separate existence; to overwhelm; to cause to disappear as if by swallowing up; to incorporate; to assimilate; to take in and use up.
  2. To engulf, as in water; to swallow up. <ref name=SOED/>
  3. To suck up; to drink in; to imbibe; as a sponge or as the lacteals of the body; to chemically take in. <ref name=SOED/>
  4. To take in energy and convert it, as<ref name=SOED/>
    1. in receiving a physical impact or vibration without recoil.
    2. in receiving sound energy without repercussion or echo.
    3. taking in radiant energy and converting it to a different form of energy, like heat.
Heat, light, and electricity are absorbed in the substances into which they pass.
  1. To engross or engage wholly; to occupy fully; as, absorbed in study or in the pursuit of wealth. <ref name=SOED/>
  2. To occupy or consume time. <ref name=SOED/>
  3. Assimilate mentally. <ref name=SOED/>
  4. To assume or pay for as part of a commercial transaction.
  5. To defray the costs.
  6. To accept or purchase in quantity.

The above text is a snippet from Wiktionary: absorb
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