Etymology
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machinery (n.)

1680s; from machine (n.) + -ery. Originally theatrical, "devices for creating stage effects" (which also was a sense of Greek mēkhanē); meaning "machines or parts of machines considered collectively," is attested from 1731. Transferred meaning "any complex system of (non-mechanical) means to carry on a particular work" is by 1770. Middle English had machinament "a contrivance" (early 15c.).

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Definitions of machinery

machinery (n.)
machines or machine systems collectively;
machinery (n.)
a system of means and activities whereby a social institution functions;
the complex machinery of negotiation
the machinery of command labored and brought forth an order
From wordnet.princeton.edu