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Latin word agrum comes from Latin -cola, Latin cultura, Proto-Indo-European *h₂eǵ-, and later Proto-Indo-European *h₂éǵros (Field, pasturage.)
ager (Latin)
Field, farm. Land, estate, park. Soil. Terrain. Territory, country.
agrum (Latin)
Accusative singular of ager, indicating its an object in the sentence.