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| least [ leest ] CORE MEANING: the smallest or lowest quantity or degree |
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1. adjective smallest amount possible: a smaller amount than anything or anyone else
 He went up the steps without showing the least anxiety.
 what I liked least of all
 The least said the soonest mended.
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2. adverb to lesser degree than others: having less of a particular quality than most other people or things
 one of the least appealing movies of the year
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3. adjective extremely small: used to emphasize that something is so small as to be almost nonexistent
 She didn't have the least idea of how to begin.
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4. adverb to smallest extent: indicates that something happens or is true to a smaller degree than at any other time
 I won the award when I was least expecting it.
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5. pron minimum: used to indicate the minimum that should be done in a situation
 The least you can do is apologize.
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| [ Old English lǣst, contraction of lǣsest< lǣs "less"] |
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at least
1. not less than an amount
 It'll take at least two days to finish.
 We traveled at least 45 miles without a rest.
2. in any case and despite anything else
 At least you still have a job.
3. indicates a correction or change
 I know the answer, at least I think I do.
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least of all emphasizes that a negative applies to one case in particular
 No one must know of our discovery - least of all our competitors.
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not (in) the least emphasizes that something is not at all the case
 He's not in the least like his sister.
 I'm not the least bit tired.
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not least emphasizes something particularly important
 suffered setbacks, not least a reduction in state funding
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to say the least without exaggerating or overstating the case
 We were surprised at her rudeness, to say the least.
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