Definition of lead-in noun from the Oxford Advanced Learner's Dictionary

 

lead-in

 noun
noun
BrE BrE//ˈliːd ɪn//
 
; NAmE NAmE//ˈliːd ɪn//
 
 
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an introduction to a subject, story, show, etc. He told an amusing story as a lead-in to his speech.
See the Oxford Advanced American Dictionary entry: lead-in