Definition of lunchtime noun from the Oxford Advanced American Dictionary

 

lunchtime

 noun
noun
NAmE//ˈlʌntʃtaɪm//
 
[uncountable, countable]
 
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the time around the middle of the day when people usually eat lunch The package still hadn't arrived by lunchtime. a lunchtime concert The sandwich bar is generally packed at lunchtimes.
See the Oxford Advanced Learner's Dictionary entry: lunchtime