Wordnet 3.0
NOUN (2)
1. 
 the economic crisis beginning with the stock market crash in 1929 and continuing through the 1930s; 
2. 
 a period during the 1930s when there was a worldwide economic depression and mass unemployment; 
[syn: Depression, Great Depression]
WordNet (r) 3.0 (2006):
Great Depression
    n 1: the economic crisis beginning with the stock market crash
         in 1929 and continuing through the 1930s
    2: a period during the 1930s when there was a worldwide economic
       depression and mass unemployment [syn: Depression, Great
       Depression]