What is the meaning of let?

noun

• A brutal terrorist group active in Kashmir; fights against India with the goal of restoring Islamic rule of India.
  • usage: "Lashkar-e-Toiba has committed mass murders of civilian Hindus"
  • synonyms: Lashkar-e-Taiba, Lashkar-e-Toiba, Lashkar-e-Tayyiba, Army of the Pure, Army of the Righteous
• A serve that strikes the net before falling into the receiver's court; the ball must be served again.
  • synonyms: net ball

verb

• Make it possible through a specific action or lack of action for something to happen.
  • usage: "This permits the water to rush in"; "This sealed door won't allow the water come into the basement"; "This will permit the rain to run off"
  • synonyms: allow, permit
• Actively cause something to happen.
  • usage: "I let it be known that I was not interested"
• Consent to, give permission.
  • usage: "She permitted her son to visit her estranged husband"; "I won't let the police search her basement"; "I cannot allow you to see your exam"
  • synonyms: permit, allow, countenance
• Cause to move; cause to be in a certain position or condition.
  • usage: "He got his squad on the ball"; "This let me in for a big surprise"; "He got a girl into trouble"
  • synonyms: get, have
• Leave unchanged.
  • usage: "let it be"
• Grant use or occupation of under a term of contract.
  • usage: "I am leasing my country estate to some foreigners"
  • synonyms: lease, rent