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

    

normal

 noun
noun
BrE BrE//ˈnɔːml//
 
; NAmE NAmE//ˈnɔːrml//
 
 
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 [uncountable] the usual or average state, level or standard above/below normal Things soon returned to normal. Word Origin mid 17th cent. (in the sense ‘right-angled’): from Latin normalis, from norma ‘carpenter's square’. Current senses date from the early 19th cent.Extra examples After a week of festivities, life returned to normal. His pulse rate had slowed to somewhere near normal. Sales to December are well below normal. The rainfall has been above normal for the time of year.Idioms
See the Oxford Advanced American Dictionary entry: normal