(New American Roget's College Thesaurus)
Endless duration
Nouns — perpetuity; everlastingness, unceasingness, etc.; eternity, infinity, aye, timewithout end, sempiternity; deathlessness, immortality, athanasia; incessance, continuity, durability, perpetuation, preservation. See stability.
Verbs — last or endure forever, have no end, never end or die; perpetuate, eternalize, eternize, immortalize, continue, preserve.
Adjectives — perpetual, everlasting, unceasing, endless, ageless, unending, having no end; [co-]eternal, everliving, everflowing, sempiternal, continual, ceaseless, incessant, uninterrupted, interminable, infinite, neverending; unfailing, evergreen, amaranthine; deathless, immortal, undying, imperishable, perdurable; permanent, lasting, enduring; perennial, long-lived, dateless, illimitable, continued, constant.
Adverbs — perpetually, in perpetuity, always, ever[more], aye; forever, forevermore, for aye, forever and a day, forever and ever; in all ages, from age to age, without end, world without end, time without end; to the end of time, to the crack of doom; till death [do us part], till doomsday, till kingdom come; constantly. Informal, for keeps, for good [and all], until hell freezes over, till the cows come home.
Antonyms, see transientness, time.
(Roget's IV) n.
1. [State of being perpetual]
Syn. constancy, endurance, continuance; see continuity 1 .
2. [Unlimited time]
Syn. eternity, forever, all time, life; see eternity 1 .
(Roget's Thesaurus II) noun 1. The quality or state of having no end: cease-lessness, endlessness, eternality, eternalness, eternity, everlastingness, world without end. See CONTINUE. 2. The totality of time without beginning or end: eternality, eternalness, eternity, infinity, sempiternity. See LIMITED.

English dictionary for students. 2013.

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