A Quick and Simple Dictionary

let

1. Verb.  (transitive) To allow, not to prevent (+ infinitive, usually without (term, to) ).
2. Verb.  (transitive) To allow the release of (a fluid).
3. Verb.  (transitive) To allow possession of (a property etc.) in exchange for rent.
4. Verb.  (transitive) Used to make a proposal, request or assumption.
5. Verb.  (obsolete, _) To cause (+ bare infinitive).
6. Verb.  (archaic) To hinder, prevent; to obstruct (someone or something).
7. Verb.  (obsolete) To prevent or obstruct (term, to) do something, or (term, that) something happen.
8. Noun.  A hindrance.
9. Noun.  (context, tennis) The hindrance caused by the net during serve, only if the ball falls legally.