Etymology
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apparatus (n.)

"a collection of tools, utensils, etc. adapted as a means to some end," 1620s, from Latin apparatus "tools, implements, equipment; preparation, a preparing," noun of state from past participle stem of apparare "prepare," from ad "to" (see ad-) + parare "make ready" (from PIE root *pere- (1) "to produce, procure").

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Definitions of apparatus

apparatus (n.)
equipment designed to serve a specific function;
Synonyms: setup
apparatus (n.)
(anatomy) a group of body parts that work together to perform a given function;
the breathing apparatus
From wordnet.princeton.edu