Definition of no adverb from the Oxford Advanced Learner's Dictionary

 

no

 adverb
adverb
BrE BrE//nəʊ//
 
; NAmE NAmE//noʊ//
 
 
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used before adjectives and adverbs to mean ‘not’ She's feeling no better this morning. Reply by no later than 21 July. Word Origin Old English , (adverb), from ne ‘not’ + ō, ā ‘ever’. The determiner arose in Middle English (originally before words beginning with any consonant except h-), reduced from non, from Old English nān, from ne ‘not’ + ān ‘one’, of Germanic origin.
See the Oxford Advanced American Dictionary entry: no