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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
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2
Eternal, endless.

It comes from Latin semper (always) and aeternus (eternal).
by Sempiternal January 03, 2010
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3
Never Changing and Never Ending ; Eternal
"This is sempiternal
Will we ever see the end?" - Bring me The Horizon / Shadow Moses
by Piercethesyko June 23, 2017
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