Wordnet 3.0
NOUN (1)
1. 
 the act of changing smoothly from one state or situation to another; 
VERB (1)
1. 
 proceed without interruption; 
 in music or talk; 
- Example: "He segued into another discourse"
WordNet (r) 3.0 (2006):
segue
    n 1: the act of changing smoothly from one state or situation to
         another
    v 1: proceed without interruption; in music or talk; "He segued
         into another discourse"