Definition of least determiner from the Oxford Advanced Learner's Dictionary

  

least

 determiner,pronoun
determiner, pronoun
BrE BrE//liːst//
 
; NAmE NAmE//liːst//
 
 
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  •  (also the least) smallest in size, amount, degree, etc. He's the best teacher, even though he has the least experience. She never had the least idea what to do about it. He gave (the) least of all towards the wedding present. How others see me is the least of my worries (= I have more important things to worry about). It's the least I can do to help (= I feel I should do more).
  • Word Origin Old English lǣst, lǣsest, of Germanic origin; related to less.Idioms  used after amounts to show that the amount is the lowest possible It'll take a year, at the very least.  not at all Really, I'm not in the least tired. ‘Do you mind if I put the television on?’ ‘No, not in the least.’ without exaggerating at all I was surprised, to say the least.
    See the Oxford Advanced American Dictionary entry: least