Dictionary.net

• a mountainous landlocked country in central Asia; bordered by Iran to the west and Russia to the north and Pakistan to the east and south; "Soviet troops invaded Afghanistan in 1979"

2006 - WordNet 3.0
By Princeton University

• a mountainous landlocked country in central Asia; bordered by Iran to the west and Russia to the north and Pakistan to the east and south; "Soviet troops invaded Afghanistan in 1979"

2011 - English Dictionary Database
By DataStellar Co., Ltd