What is the meaning of withdrawal?

noun

• A retraction of a previously held position.
  • synonyms: backdown, climb-down
• The act of taking out money or other capital.
• The act of withdrawing.
  • usage: "the withdrawal of French troops from Vietnam"
• Avoiding emotional involvement.
  • synonyms: detachment
• The act of withdrawing blood, tumors, etc..
  • usage: "the nurse was expert at the withdrawal of blood"
• The act of ceasing to participate in an activity.
• A method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation.
  • synonyms: coitus interruptus, withdrawal method, pulling out, onanism
• Formal separation from an alliance or federation.
  • synonyms: secession
• The termination of drug taking.
  • synonyms: drug withdrawal