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Latin word Vacuna comes from Proto-Indo-European *h₁weh₂-, Proto-Indo-European *ewə-
*h₁weh₂- (Proto-Indo-European)
*ewə- (Proto-Indo-European)
to lack; empty
*h₁uh₂-ko- (Proto-Indo-European)
*wakāō (Proto-Italic)
vaco (Latin)
I am empty, void. I am free to attend, have time, am not under other obligation. I am idle, at leisure. I am unoccupied, vacant.
Vacuna (Latin)
(Roman god) The goddess of rural leisure, worshipped by the Sabines.