What is Let?

Legal Definition
To hire, to lease; to grant the use and possession of something for a compensation.

2. This term is applied to real estate and the words to hire are more commonly used when speaking of personal estate. See Hire, Hirer, and Letter.

3. Letting is very similar to selling; the difference consists, in this; that instead of selling the thing itself, the letter sells only the use of it.
-- Bouviers Law Dictionary
Legal Definition
n. In old conveyancing. Hindrance; obstruction; interruption. Still occasionally used in the phrase "without any let, suit, trouble," etc.
-- Black's Law Dictionary
Legal Definition
v. In conveyancing. To demise or lease. "To let and set" is an old expression. In practice. To deliver. "To let to bail" is to deliver to ball on arrest. In contracts. To award to one of several persons, who have submitted proposals therefor, the contract for erecting public works or doing some part of the work connected therewith, or rendering some other service to government for a stipulated compensation. Letting the contract is the choosing one from among the number of bidders, and the formal making of the contract with him. The letting, or putting out, is a different thing from the invitation to make proposals; the letting is subsequent to the invitation. It is the act of awarding the contract to the proposer, after the proposals have been received and considered. See Eppes v. Railroad Co., 35 Ala. 33, 55. In the language of judicial orders and decrees, the word "let" (in the imperative) imports a positive direction or command. /Thus the phrase "let the writ issue as prayed" is equivalent to "it is hereby ordered that the writ issue," etc. See Ingram v. Laroussini, 50 La. Ann. 69, 23 South. 498.
-- Black's Law Dictionary
Legal Definition
Hinderance, obstacle, obstruction; as, without let, molestation or hinderance.
-- Bouviers Law Dictionary
Legal Definition
To demise; to lease.
-- Ballentine's Law Dictionary