nought /nɔːt $ nɒːt/ BrE AmE number
1 . British English the number 0 SYN zero :
A billion is 1 with 9 noughts after it.
nought point one/two/three etc (=0.1, 0.2 etc)
2 . old use used in some expressions to mean nothing:
Peace negotiations came to nought (=were not successful) .
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THESAURUS
▪ zero the number 0. Also used when saying there is nothing at all:
A million is written as one followed by six zeros.
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a temperature of zero degrees
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Our chances of success are virtually zero.
▪ nil British English zero - used especially in the results of sports games:
United won the game three-nil.
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In rural areas, employment opportunities are almost nil.
▪ nought British English spoken zero – used in calculations and figures:
It has increased by nought point seven five per cent (=0.75%) .
▪ O used to say the number 0 like the letter O:
The code for Oxford is 0 one eight six five (=01865) .