Etymology
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lead-in (n.)

1913, in electrical wiring, from verbal phrase; see lead (v.1) + in (adv.). General sense of "introduction, opening" is from 1928, originally in music.

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Definitions of lead-in

lead-in (n.)
the introductory section of a story;
it was an amusing lead-in to a very serious matter
Synonyms: lead / lede
lead-in (n.)
wire connecting an antenna to a receiver or a transmitter to a transmission line;
From wordnet.princeton.edu