1. The main or original sequence of events in a narrative, especially in science fiction or time travel contexts
In the movie, the characters must protect the primary timeline from being altered by time travelers.
No filme, os personagens devem proteger a linha do tempo primária de ser alterada por viajantes do tempo.
2. The principal historical or chronological sequence considered the standard or canonical version of events
The primary timeline represents the actual course of history before any divergences occurred.
A linha do tempo primária representa o curso real da história antes de qualquer divergência ocorrer.