Definition of off noun from the Oxford Advanced Learner's Dictionary

 

off

 noun
noun
BrE BrE//ɒf//
 
; NAmE NAmE//ɔːf//
 
, NAmE//ɑːf//
 
 
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[singular] the off the start of a race They're ready for the off. Word Origin Old English, originally a variant of of (which combined the senses of ‘of’ and ‘off’).
See the Oxford Advanced American Dictionary entry: off