1. noun
a) equipment or paraphernalia, especially that used for an athletic endeavor.
b) a wheel with grooves (teeth) engraved on the outer circumference, such that two such devices can interlock and convey motion from one to the other.
2. verb
To fit with gears in order to achieve a desired gear ratio.
3. interjection
(mostly British (Scouse)) great or fantastic
Wikipedia foundation.