1. A sequence of events or history that has been changed from its original course, typically in science fiction contexts involving time travel or parallel universes
The character discovered she was living in an altered timeline after the accident.
A personagem descobriu que estava vivendo em uma timeline alterada após o acidente.
2. A modified chronological sequence of events different from what actually occurred or was expected
In this altered timeline, the war never happened.
Nesta timeline alterada, a guerra nunca aconteceu.