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English definition of “least”

least

adverb, determiner, pronoun uk   /liːst/ us  
B1 less than anything or anyone else; the smallest amount or number: This group is the least likely of the four to win. Disaster struck when we least expected it. It was the answer she least wanted to hear. I like the green one least of all. He's the relative I like (the) least. No one believed her, least of all (= especially not) the police. They refused to admit her, not least because (= there were several reasons but this was an important one) she hadn't got her membership card with her.
(Definition of least from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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