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Definition of g8:
(n) :
(politics, historical, 1997–2014) The eight leading industrialized nations: Germany, Canada, the United States, France, Italy, Japan, the United Kingdom and Russia.
(n) :
The former annual meeting of their leaders (prior to Russia's 2014 expulsion from the group).
(n) :
(Internet slang, text messaging) Abbreviation of gate. [A doorlike structure outside a house.]