agriculture (n.)

mid-15c., "tillage, cultivation of large areas of land to provide food," from Late Latin agricultura "cultivation of the land," a contraction of agri cultura "cultivation of land," from agri, genitive of ager "a field" (from PIE root *agro- "field") + cultura "cultivation" (see culture (n.)). In Old English, the idea could be expressed by eorðtilþ.

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Definitions of agriculture from WordNet
agriculture (n.)
a large-scale farming enterprise;
Synonyms: agribusiness / factory farm
agriculture (n.)
the practice of cultivating the land or raising stock;
Synonyms: farming / husbandry
agriculture (n.)
the class of people engaged in growing food;
Agriculture (n.)
the federal department that administers programs that provide services to farmers (including research and soil conservation and efforts to stabilize the farming economy); created in 1862;
Synonyms: Department of Agriculture / Agriculture Department / usda