adj. everlasting, that is having infinite temporal duration; as opposed to eternal, outside time and thus lacking temporal duration
the GNU version of the Collaborative International Dictionary of English
adj. Of neverending duration; everlasting; endless; having beginning, but no end.
adj. Without beginning or end; eternal.
The Century Dictionary and Cyclopedia
Eternal; everlasting; endless; having no end.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. having no known beginning and presumably no end
Word Usage
"Meanwhile the Underground festers and dies at the weekend, as sempiternal and glacially-proceeding 'engineering works' bring it to its umpteenth year of standstill"