Definition of: gear

(gir) noun
1. Mech. a The moving parts or appliances that constitute a whole or set, serving to transmit motion or change its rate or direction: valve gear, reversing gear. b A cogwheel. c The engagement of toothed wheels or other parts in a mechanical assembly.
2. Naut. The ropes, blocks, etc., used in working a spar or sail; all the rigging of a ship.
3. Fitness for harmonious and effective action; working relationship: out of gear.
4. Any equipment, as dress, vestments, warlike accouterments, harness, tools, or household necessaries.
5. Archaic Property; possessions; goods.
6. Archaic Arms; armor.
—v.t.
1. Mech. a To put into gear. b To equip with gears. c To connect by means of gears.
2. To regulate so as to match or suit something else: to gear production to demand.
3. To put gear on; harness; dress.
—v.i.
4. To come into or be in gear; mesh. [<ON gervi equipment]