N. perpetuity, eternity, everness, aye, sempiternity, immortality, athanasia, interminability, agelessness, everlastingness, perpetuation, continued existence, uninterrupted existence, perennity, permanence (durability) 110

V. last forever, endure forever, go on forever, have no end, eternize, perpetuate

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

Adv. perpetually, 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, to the end of time, to the crack of doom, to the "last syllable of recorded time", till doomsday, constantly

Phr. esto perpetuum, labitur et labetur in omne volubilis oevum, "but thou shall flourish in immortal youth", "eternity! thou pleasing, dreadful thought", "her immortal part with angels lives", ohne rast, ora e sempre

N. synchronism, coexistence, coincidence, simultaneousness, simultaneity, concurrence, concomitance, unity of time, interim, isochronism, contemporary, coetanian

V. coexist, concur, accompany, go hand in hand, keep pace with, synchronize

Adj. synchronous, synchronal, synchronic, synchronical, synchronistical, simultaneous, coexisting, coincident, concomitant, concurrent, coeval, coevous, contemporary, contemporaneous, coetaneous, coeternal, isochronous

Adv. at the same time, simultaneously, together, in concert, during the same time, in the same breath, pari passu, in the interim, as one, at the very moment, just as, as soon as, meanwhile