Wordnet 3.0
NOUN (1)
1. 
 the introductory section of a story; 
- Example: "it was an amusing lead-in to a very serious matter"[syn: lead, lead-in, lede]
WordNet (r) 3.0 (2006):
lede
    n 1: the introductory section of a story; "it was an amusing
         lead-in to a very serious matter" [syn: lead, lead-in,
         lede]