| gear | | |
| n. (artifact) | 1. cogwheel, gear, gear wheel, geared wheel | a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion. |
| ~ bevel gear, pinion and crown wheel, pinion and ring gear | gears that mesh at an angle. |
| ~ cog, sprocket | tooth on the rim of gear wheel. |
| ~ escape wheel | gear that engages a rocking lever. |
| ~ pinion | a gear with a small number of teeth designed to mesh with a larger wheel or rack. |
| ~ epicyclic gear, planet gear, planet wheel, planetary gear | an outer gear that revolves about a central sun gear of an epicyclic train. |
| ~ rack and pinion | a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa). |
| ~ spur gear, spur wheel | gear wheels that mesh in the same plane. |
| ~ sun gear | the central gear in an epicyclic train. |
| ~ tooth | one of a number of uniform projections on a gear. |
| ~ wheel | a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines). |
| ~ worm gear | gear consisting of a shaft with screw thread (the worm) that meshes with a toothed wheel (the worm wheel); changes the direction of the axis of rotary motion. |
| ~ worm wheel | gear with the thread of a worm. |
| n. (artifact) | 2. gear, gearing, geartrain, power train, train | wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed.; "the fool got his tie caught in the geartrain" |
| ~ engine | motor that converts thermal energy to mechanical work. |
| ~ epicyclic gear train, epicyclic train | a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis. |
| ~ reduction gear | gearing that reduces an input speed to a slower output speed. |
| ~ wheelwork | mechanical device including an arrangement of wheel in a machine (especially a train of gears). |
| n. (artifact) | 3. gear, gear mechanism | a mechanism for transmitting motion for some specific purpose (as the steering gear of a vehicle). |
| ~ first gear, low gear, low, first | the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving. |
| ~ gearset | a set of gears. |
| ~ high gear, high | a forward gear with a gear ratio that gives the greatest vehicle velocity for a given engine speed. |
| ~ mechanism | device consisting of a piece of machinery; has moving parts that perform some function. |
| ~ park | a gear position that acts as a parking brake.; "the put the car in park and got out" |
| ~ reverse gear, reverse | the gears by which the motion of a machine can be reversed. |
| ~ second gear, second | the gear that has the second lowest forward gear ratio in the gear box of a motor vehicle.; "he had to shift down into second to make the hill" |
| ~ steering gear | a gear that couples the steering wheel to the steering linkage of a motor vehicle. |
| ~ third gear, third | the third from the lowest forward ratio gear in the gear box of a motor vehicle.; "you shouldn't try to start in third gear" |
| ~ transmission system, transmission | the gears that transmit power from an automobile engine via the driveshaft to the live axle. |
| n. (artifact) | 4. appurtenance, gear, paraphernalia | equipment consisting of miscellaneous articles needed for a particular operation or sport etc.. |
| ~ equipment | an instrumentality needed for an undertaking or to perform a service. |
| ~ fishing gear, fishing rig, fishing tackle, tackle, rig | gear used in fishing. |
| ~ kit, outfit | gear consisting of a set of articles or tools for a specified purpose. |
| ~ regalia | paraphernalia indicative of royalty (or other high office). |
| ~ rig | gear (including necessary machinery) for a particular enterprise. |
| ~ rigging, tackle | gear consisting of ropes etc. supporting a ship's masts and sails. |
| ~ saddlery, stable gear, tack | gear for a horse. |
| v. (change) | 5. gear, pitch | set the level or character of.; "She pitched her speech to the teenagers in the audience" |
| ~ adapt, accommodate | make fit for, or change to suit a new purpose.; "Adapt our native cuisine to the available food resources of the new country" |
| ~ popularise, popularize | make understandable to the general public.; "Carl Sagan popularized cosmology in his books" |
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