The Collaborative International Dictionary of English v.0.48:

Vacuna \Va*cu"na\ (v[.a]*k[=u]"n[.a]), prop. n. [L. fr. vacuus
   unoccupied.] (Rom. Myth.)
   The goddess of rural leisure, to whom the husbandmen
   sacrificed at the close of the harvest. She was especially
   honored by the Sabines.
   [1913 Webster]