NB Definition in the Cambridge English Dictionary
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Definition of “NB” - English Dictionary

Definition of "NB" - British English Dictionary

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NB

uk   us   /ˌenˈbiː/ formal
written before a ​piece of ​importantinformation to make ​readersnotice it: NB Applications ​received after the ​closingdate will not be ​accepted.
(Definition of NB from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "NB" - Business English Dictionary

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NB

(also nb) uk   us  
written abbreviation used before a ​piece of important ​information to make ​certain that ​readersnotice it: NB All ​prices are ​quoted for a low-season week ​starting January 6/7.
(Definition of NB from the Cambridge Business English Dictionary © Cambridge University Press)
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