Alien Day
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
April 26, as a "fan holiday" celebrating the science-fiction horror franchise Alien. The date 4/26 is in reference to fictional planet LV-426 where the Xenomorph was first unveiled.
Register: slang
Where it’s used:
Used
American English
Examples
The Bottleneck Gallery in Williamsburg, Brooklyn is also holding an Alien Day special
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 “Alien Day” mean?
April 26, as a "fan holiday" celebrating the science-fiction horror franchise Alien. The date 4/26 is in reference to fictional planet LV-426 where the Xenomorph was first unveiled.
Is “Alien Day” formal or informal?
Alien Day is generally slang.