Eternal and Everlasting; also coincidentally the name of the latest Bring Me The Horizon album. The title comes from a line in the song, "THIS IS SEMPITERNAL, WILL WE EVER SEE THE END? THIS IS SEMPITERNAL, OVER AND OVER AGAIN AND AGAIN."

Also a common joke that it is really "sandpit turtle".....it isn't
boy: "Wow, that new BMTH album is really good!"
friend: "Yeah, I love sempiternal!"

teacher: "They saw that knowledge is eternal."
other teacher: "indeed, it is sempiternal!"
by jessica sky June 16, 2013
Get the Sempiternal mug.
Eternal, endless.

It comes from Latin semper (always) and aeternus (eternal).
by Sempiternal January 3, 2010
Get the Sempiternal mug.
"This is sempiternal
Will we ever see the end?" - Bring me The Horizon / Shadow Moses
by Piercethesyko June 23, 2017
Get the Sempiternal mug.
A young (commonly 11 - 14) female who claims to be a 'fan' of Bring Me The Horizon, when in reality the only Album they know/like is the band's 2013 Album Sempiternal, only like Oli Sykes (lead singer) And ignore te existance of the rest of BMTH. They will get utterly confused if you mention past Albums (when they created Deathcore genre) - This Is What the Edge of Your Seat Was Made For (2004), Count Your Blessings (2006) and Suicide Season (2008). It is advised not to approach them.
BMTH Fan: Look, there goes another Sempiternal Fangirl

Sempiternal Fangirl: omfg Oli Sykes is so f-ing hot, wanna listen to Sempiternal?
by BandsCatsUnicornsAngels September 16, 2015
Get the Sempiternal Fangirl mug.