"occurring at the same time," 1775, shortening of synchronical (1650s), from Late Latin synchronus "simultaneous" (see synchronous). Linguistic sense is first recorded 1922, probably a borrowing from French synchronique (de Saussure, 1913). Synchronal "simultaneous" is from 1650s. Related: synchronically.
synchronic linguistics
synallagmatic
synapse
synapsis
synaptic
sync
synchronic
synchronicity
synchronism
synchronization
synchronize
synchronous