Etymology
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gear (n.)

c. 1200, "fighting equipment, armor and weapons," probably from Old Norse gørvi (plural gørvar) "apparel, gear," related to görr, gørr, gerr "skilled, accomplished; ready, willing," and to gøra, gørva "to make, construct, build; set in order, prepare," a very frequent verb in Old Norse, used in a wide range of situations from writing a book to dressing meat. This is from Proto-Germanic *garwjan "to make, prepare, equip" (source also of Old English gearwe "clothing, equipment, ornament," which may be the source of some uses; Old Saxon garwei; Dutch gaar "done, dressed;" Old High German garo "ready, prepared, complete," garawi "clothing, dress," garawen "to make ready;" German gerben "to tan").

From early 14c. as "wearing apparel, clothes, dress;" also "harness of a draught animal; equipment of a riding horse." From late 14c. as "equipment generally; tools, utensils," especially the necessary equipment for a certain activity, as the rigging of a sailing ship. It was used generically as an affix in 16c. canting slang for "thing, stuff, material." Meaning "toothed wheel in machinery" first attested 1520s; specific mechanical sense of "parts by which a motor communicates motion" is from 1814; specifically of a vehicle (bicycle, automobile, etc.) by 1888. Slang for "male sex organs" from 1670s.

gear (v.)

c. 1200, "to equip oneself for fighting; to dress," probably from gear (n.) or from the verb in Old Norse. Mechanical meaning "put (machinery) in gear" is from 1851. Related: Geared; gearing.

gear (adj.)

"stylish, excellent," British slang, 1951 (popularized c. 1963 by the Beatles), said to be from earlier that's the gear, an expression of approval (1925), from gear (n.).

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Definitions of gear
1
gear (n.)
a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion;
Synonyms: gear wheel / geared wheel / cogwheel
gear (n.)
wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed;
Synonyms: gearing / geartrain / power train / train
gear (n.)
a mechanism for transmitting motion for some specific purpose (as the steering gear of a vehicle);
Synonyms: gear mechanism
gear (n.)
equipment consisting of miscellaneous articles needed for a particular operation or sport etc.;
2
gear (v.)
set the level or character of;
Synonyms: pitch
From wordnet.princeton.edu