Machinery/məˈʃiːnəri/ Definition 1 of 3Pro Tip 1/3Physical Objects Refers to actual machines you can see and touch, often large and heavy. The factory invested in new machinery to increase production. Pro Tip 2/3Collective Term Used to talk about multiple machines together, not just one. The construction site was packed with machinery. Pro Tip 3/3Operating Caution Implies potential danger or the need for skill to operate. Only trained workers should handle this heavy machinery.