diachronic

adjective2

1. •
   Occurring over or changing with time.

   • […] one salient value of archival magazine preservation is that individual issues register, however unintentionally, the small, incremental, diachronic movements within a culture. — 2005
2. •
   Of, pertaining to or concerned with changes that occur over time.

   • I also take a more diachronic perspective and relate the growth of empire to changes in the regional market system as they occurred in the transition from the Early Aztec to the Late Aztec periods. — 1996