Meaning of “at least” in the English Dictionary

american-english dictionary

"at least" in British English

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at least

A2 as much as, or more than, a number or amount:

It will cost at least $100.
It will be £200 at the very least.
You'll have to wait at least an hour.

B2 used to reduce the effect of a statement:

I've met the president - at least, he shook my hand once.
See also

B1 used to emphasize that something is good in a bad situation:

It's a small house but at least there's a garden.

B1 used to say that someone should do something small, even if they do nothing else:

Even if she didn't want to send a present, she could at least have sent a card.

(Definition of “at least” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"at least" in American English

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at least

used to emphasize that something is good in a bad situation:

The car was damaged, but at least he wasn’t hurt.
At (the very) least

At (the very) least means not less than:

It will cost at least $1000.
I’ll be gone for two weeks, at the very least.
At least

At least can also be used to reduce the effect of a statement:

I can handle it – at least, I think so.

(Definition of “at least” from the Cambridge Academic Content Dictionary © Cambridge University Press)