Definition of punctual adjective from the Oxford Advanced American Dictionary

 

punctual

 adjective
adjective
NAmE//ˈpʌŋktʃuəl//
 
 
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happening or doing something at the arranged or correct time; not late She has been reliable and punctual. a punctual start at 9 o'clock Always be punctual for an interview.
punctuality
 
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NAmE//ˌpʌŋktʃuˈælət̮i//
 
noun [uncountable] He insists on regular attendance and punctuality.
NAmE//ˈpʌŋktʃuəli//
 
adverb They always pay punctually.
See the Oxford Advanced Learner's Dictionary entry: punctual