synchromesh Syllabification: (syn·chro·mesh)Pronunciation: /ˈsiNGkrōˌmeSH/Translate synchromesh | into German Definition of synchromesh noun a system of gear changing, especially in motor vehicles, in which the driving and driven gearwheels are made to revolve at the same speed during engagement by means of a set of friction clutches, thereby easing the change. Origin: 1920s: contraction of synchronized meshsynchromesh in other Oxford dictionaries Definition of synchromesh in the British & World English dictionary