Apparatus

google

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early 17th century: Latin, from apparare ‘make ready for’, from ad- ‘towards’ + parare ‘make ready’.

wiktionary

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Borrowed from Latin apparātus. Doublet of apparat.

etymonline

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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").