The definition of a factory is where something is made or assembled.(noun)
An example of a factory is a place where cars are built.
A factory is defined as something that makes things quickly and in great quantities.(noun)
An example of factory is a child's school where germs are spread quickly, a "germ factory."
See factory in Webster's New World College Dictionary
noun pl. factories
Origin: < Port feitoriaa trading settlement maintained by factors
Origin: Fr factorie < facteur: see factor
See factory in American Heritage Dictionary 4
noun pl. fac·to·ries
Origin: Late Latin factōria, oil press, mill
Origin: , and Medieval Latin factōria, establishment for factors
Origin: , both from Latin factor, factor; see factor.
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