The story
- Proto-Indo-European*ḱe?
- Proto-Indo-European*ḱómder.?
- Proto-Indo-European*sem-der.?
- Proto-Hellenic*ksún
- Ancient Greekσύν (sún)
- Ancient Greekσῠν- (sŭn-)
- Ancient Greekσυγ- (sug-)
- Ancient Greekχρόνος (khrónos)
- Ancient Greekσῠ́γχρονος (sŭ́nkhronos)
- Ancient Greekσυγχρονίζω (sunkhronízō)
- English todaysynchronize
From Ancient Greek συγχρονίζω (sunkhronízō), equivalent to syn- + chrono- + -ize.
Etymology from Wiktionary, CC BY-SA 4.0.