Roget's Thesaurus: Entry 112 (Endless duration)

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#112. [Endless duration.] Perpetuity. -- N. perpetuity, eternity, everness[obs], aye, sempiternity[obs], immortality, athanasia[obs]; interminability[obs], agelessness[obs], everlastingness &c. adj.; perpetuation; continued existence, uninterrupted existence; perennity[obs]; permanence (durability) 110.

V. last forever, endure forever, go on forever; have no end.

eternize, perpetuate.

Adj. perpetual, eternal; everduring[obs], everlasting, ever-living, ever-flowing; continual, sempiternal[obs]; coeternal; endless, unending; ceaseless, incessant, uninterrupted, indesinent[obs], unceasing; endless, unending, interminable, having no end; unfading[obs], evergreen, amaranthine; neverending[obs], never-dying, never-fading; deathless, immortal, undying, imperishable.

Adv. perpetually &c. adj.; always, ever, evermore, aye; for ever, for aye, till the end of the universe, forevermore, forever and a day, for ever and ever; in all ages, from age to age; without end; world without end, time without end; in secula seculorum[Lat]; to the end of time, to the crack of doom, to the "last syllable of recorded time" [Macbeth]; till doomsday; constantly &c. (very frequently) 136.

Phr. esto perpetuum[Lat]; labitur et labetur in omne volubilis oevum [Lat][Horace]; "but thou shall flourish in immortal youth" [Addison]; "Eternity! thou pleasing, dreadful thought" [Addison]; "her immortal part with angels lives" [Romeo & Juliet]; ohne Rast [Ger][Goethe's motto]; ora e sempre[It].