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1. Of a periodic signal, pertaining to transmission in which the time interval separating any two corresponding transitions is equal to the unit interval or to a multiple of the unit interval. (188) 2. Pertaining to data transmission in which corresponding significant instants of two or more sequential signals have a constant phase relationship. Note: "Isochronous" and "anisochronous" are characteristics, while "synchronous" and "asynchronous" are relationships.