TOS
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
Initialism of the old series or the original series.
Register: slang
Where it’s used:
Used
American English
Examples
Star Trek: TOS; Battlestar Galactica: TOS
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “TOS” mean?
Initialism of the old series or the original series.
Is “TOS” formal or informal?
TOS is generally slang.