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History
History
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Meaning:
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a set of toothed wheels working together in a machine, e.g. to connect the engine of a vehicle with the road wheels

equipment

accessory apparatus harness instrument kit luggage machinery material paraphernalia stuff supply accouterment adjunct appendage appurtenance baggage belongings contraption effects encumbrances fittings habiliment impedimenta materiel means outfit possessions rigging setup tackle things tools trappings kit and kaboodle
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Cases of word usage

1) the landing gear of an aircraft (undercarriage)

GEAR as in Wiktionary
GEAR as in Wikipedia