Allowing or accepting something you don't necessarily like or agree with; putting up with something.
From Latin 'tolerare' meaning 'to bear or endure'. The word entered English through Old French and has meant 'to put up with' since the 1500s.
Tolerance is weirdly mathematical—your brain literally has a threshold for how much irritation it will bear before the tolerate function breaks down, which is why the same annoying sound bothers you more when you're tired.
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