synchromesh

(siŋ′krə mes̸h′, sin′-)

adjective

a device in a transmission system that automatically brings the gears to be meshed to about the same speed of rotation before a shift occurs

Origin: synchro- + mesh

See synchromesh in American Heritage Dictionary 4

noun

An automotive gear-shifting system in which the gears are synchronized at the same speeds before engaging to effect a smooth shift.
A gear in such a system.

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