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1 [only before noun] British English used to talk about a disadvantage of a thing or situation [≠ plus]:
2 less than zero - used especially when talking about temperatures : 
At night temperatures sometimes fall to minus 30°.a minus quantity
At night temperatures sometimes fall to minus 30°.a minus quantity3 a mark used in a system of judging students' work. An 'A minus' is slightly lower than a 'A', but higher than a 'B'. [≠ plus]
