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quadratic equation

view main entry for quadratic equationnoun [countable] maths  /kwɒˌdrætɪk ɪˈkweɪʒ(ə)n/ 
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hostile architecture

the design of buildings or public spaces in a way which discourages people from touching, climbing or sitting on them …

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boots on the ground

a situation in which a country's armed forces are physically present in an area of conflict …

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