SG Heritage Dictionary

Gearing [Participle present tense] Webster's Dictionary 1828

Gearing [Noun] Webster's Dictionary 1913

2. The parts by which motion imparted to one portion of an engine or machine is transmitted to another, considered collectively; as, the valve gearing of locomotive engine; belt gearing; esp., a train of wheels for transmitting and varying motion in machinery.

Gearing [Present participle and verbal noun] Webster's Dictionary 1913

of Gear