Search Result for "green revolution":
Wordnet 3.0

NOUN (1)

1. the introduction of pesticides and high-yield grains and better management during the 1960s and 1970s which greatly increased agricultural productivity; 



WordNet (r) 3.0 (2006):

green revolution
    n 1: the introduction of pesticides and high-yield grains and
         better management during the 1960s and 1970s which greatly
         increased agricultural productivity