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Webster 1913 Edition

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Noun.

[Sp.]

A dry measure in Spain and Spanish America, varying from 1[GREEK] to 2[GREEK] bushels; also, a measure of land.

De Colange.

fanega ‎(plural fanegas)

Any of various units of dry capacity, mass and land area used in Spain and the Spanish-speaking world; originally a unit of dry capacity used for grain.
A former unit of area, the amount of land that would be sown with a fanega of seed.

fanega f ‎(plural fanegas)

fanega (Measure of grain) (in Castile, it was equivalent to roughly 12 Imperial bushels or 55.5 liters)
fanega (Measure of land) (the amount of land that could be sewn with one fanega of seed)
bushel