A Spanish unit of length, approximately 277.777 millimeters. It is the old Roman foot, as distinct from the Castilian pie.¹ It is also defined as 0.00005 of a legua comun (20 such legua to a degree of the meridian).
The vara was defined in 1801 as 3 pie geometricos.
1. Academia Espanola.
Diccionario de la lengua castellana, undecima edicion.
Madrid: imprenta de Don Manual Rivadeneyra, 1869.
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Last revised: 2 June 2007.