Occurring at exactly the same time or operating in unison with precise coordination.
From Greek 'synchronos' - 'syn' (together) + 'chronos' (time), meaning 'happening at the same time.' The verb form entered English in the 17th century, with the adjective following later.
Fireflies in Southeast Asia can synchronize their flashing across entire trees, creating spectacular natural light shows. Scientists discovered this happens because each firefly adjusts its rhythm slightly to match its neighbors, demonstrating how complex coordination can emerge from simple local interactions.
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