lead-in /ˈliːdɪn/noun 3lead in verb 1forms 4 noun3 •An introduction; something that leads into the beginning of something.After the long lead-in, the climax of the story was a disappointment. •A region of data at the beginning of a compact disc, holding the table of contents. •A short phrase that begins the caption of a photograph. lead in verb1 •To introduce, to mark the beginning of something, especially in music.I'll play the first couple of bars by myself to lead you in. formsled in · leading in · leads in · lead-ins