1. to allow or permit: to let him escape.
2. to allow to pass, go, or come: to let us through.
3. to grant the occupancy or use of (land, buildings, rooms, space, etc., or movable property) for rent or hire (sometimes followed by out ).
4. to contract or assign for performance, usually under a contract: to let work to a carpenter.
5. to cause to; make: to let one know the truth.