Green’s Dictionary of Slang

grounation n.

[? ety. unknown; ? Fr. grosnation, a great nation or fig. use of SE groan, i.e. shout out + sfx -ation]

(W.I. Rasta) a large, island-wide meeting-cum-celebration for Rastafarians.

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[WI]L. Barrett Soul-Force 195: The cult’s day-to-day operations; collecting dues, introducing new members and planning for a future ‘grounation’ or dance.