factory (n.) Look up factory at Dictionary.com
1550s, "estate manager's office," from Middle French factorie (15c.), from Late Latin factorium "office for agents ('factors')," also "oil press, mill," from Latin factor "doer, maker" (see factor (n.)). From 1580s as "establishment of merchants and factors in a foreign place." Sense of "building for making goods" is first attested 1610s. Factory farm attested from 1890.