'lead-in' definitions:

Definition of 'lead-in'

(from WordNet)
noun
The introductory section of a story; "it was an amusing lead-in to a very serious matter" [syn: lead, lead-in, lede]
noun
Wire connecting an antenna to a receiver or a transmitter to a transmission line

Definition of 'lead-in'

From: GCIDE
  • lead-in \lead-in\ n.
  • 1. (Elec.) a wire connecting an antenna to a receiver or a transmitter to a transmission line. [WordNet 1.5]
  • 2. (Radio and Television Broadcasting) The short segment of a program or program script introducing and immediately preceding another part of the program or a commercial. [PJC]