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English definition of “least”

least

adverb, determiner, pronoun     /liːst/
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.Maximum and minimum Grammar:Least, the least, at leastWe use the quantifier least to talk about quantities, amounts and degree. (The) least is the superlative form of little.
(Definition of least adverbdeterminerpronoun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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