"Sempiternal" is an archaic English word denoting the concept of "everlasting time" that can never actually come to pass. Sykes explained to The Independent why they used it for the album title. "It symbolizes a lot of different things, some of which were intended, some that kind of came together," he said. "This album needs to be the one that lasts forever, just by Bring Me The Horizon, no guests, no gimmicks, no nothing. It's straight up us, it represents what we're about, what we do, and what we've spent the last 10 years doing, working on, and progressing."
"The flower of life - which is the cover of the album - means a lot of things," he continued "but it boils down to simply representing everything, it's the life of everything and that's where 'Sempiternal' comes from. The ongoing theme of the album is that every song is about a different point, with a different story and a different message, it's a step-by-step concept. When you get the album, it will have it laid out in steps.
"Each song represents a different kind of realization," Sykes concluded, "whether that's credence, admission or religion. It's a process. Sempiternal stands for the realization of something that's never going to go away. People have afflictions and diseases that you can't get rid of and sometimes - no matter how hard you try - it's always there."