from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Enduring forever; eternal. See Synonyms at infinite.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Seemingly everlasting or eternal.
- adj. everlasting, that is having infinite temporal duration; as opposed to eternal, outside time and thus lacking temporal duration
from 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.
from The Century Dictionary and Cyclopedia
- Eternal; everlasting; endless; having no end.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. having no known beginning and presumably no end
Middle English, from Old French sempiternel, from Late Latin sempiternālis, from Latin sempiternus : semper, always; see sem-1 in Indo-European roots + aeternus, eternal; see aiw- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Medieval Latin sempiternālis, from Latin sempiternus, a contraction of semperæternus, from semper ("always") + æternus ("eternal"). Possibly via French sempiternel. (Wiktionary)