lead-inPronunciation: /ˈliːdɪn/Translate lead-in | into Italian Definition of lead-in noun 1an introduction or preamble which allows one to move smoothly on to the next part of something: [as modifier]:the lead-in note 2a wire leading in from outside, especially from an aerial to a receiver or transmitter. lead-in in other Oxford dictionaries Definition of lead-in in the US English dictionary