let definition

1. a serve that strikes the net before falling into the receiver's court; the ball must be served again
2. make it possible through a specific action or lack of action for something to happen
• examples: This permits the water to rush in
• examples: This sealed door won't allow the water come into the basement
• examples: This will permit the rain to run off
3. actively cause something to happen
• examples: I let it be known that I was not interested
4. leave unchanged
• examples: let it be