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English definition of “let”

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let

verb uk   /let/ ( present participle letting, past tense and past participle let) us  

let verb (ALLOW)

B1 [T + infinitive without to] to allow something to happen or someone to do something by not doing anything to stop an action or by giving your permission: She wanted to go but her parents wouldn't let her. He decided to let his hair grow long. Let your shoes dry completely before putting them on. I'm letting you stay up late, just this once. Don't let it worry you. If he needs money, let him (= he should) earn it! [T + obj + infinitive without to , not in past tenses] used to show that you accept what is going to happen, although you do not like it: Let it rain - it won't spoil our afternoon. [T + obj + infinitive without to , not in past tenses] used to say that you wish something to happen very much: Oh, please let him get the job!
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let verb (SUGGEST)

let's ( also formal let us)
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A2 used to express a suggestion or request that includes you and the other person or people: Let's go out to dinner. Let us consider all the possibilities. Let's not ( UK also don't let's) argue.

let verb (RENT)

[T] mainly UK ( US usually rent) to allow your house or land to be lived in or used by someone else in exchange for a regular payment: They are letting their house (out) for the summer. He's let his flat to a young couple. She has a room to let in her house.

let

adverb uk   /let/ us  
let alone C1 used after a negative statement to emphasize how unlikely a situation is because something much more likely has never happened: Some people never even read a newspaper, let alone a book.

let

noun uk   /let/ us  

let noun (SPORT)

sports [C] (in tennis or similar games) a situation in which the ball touches the net as it crosses it, so that you have to play the point again

let noun (LAW)

without let or hindrance specialized without being prevented from doing something: People will be able to travel from country to country without let or hindrance.

let noun (RENT)

[C] UK the act of allowing someone to use your house, land, etc. in exchange for regular payments: a five-year let on a flat
(Definition of let verb, adverb, noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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