PS, Parthian shot, abidingness, addendum, afterthought, age, antiquity, appendix, back matter, ceaselessness, chorus, coda, codicil, coeternity, colophon, conclusion, consequence, constancy, continualness, continuation, defeat of time, defiance of time, diuturnity, double take, durability, durableness, duration, dying words, endlessness, endurance, envoi, epilogue, eternalness, eternity, ever-duringness, everlastingness, everness, follow-through, follow-up, foreverness, immutability, incessancy, indestructibility, infinite duration, infinity, interminability, last words, lastingness, long-lastingness, long-livedness, long standing, longevity, maintenance, never-endingness, parting shot, perdurability, perennation, perenniality, perennialness, permanence, peroration, perpetualness, perpetuity, persistence, postface, postfix, postlude, postscript, refrain, run, second thought, sempiternity, sequel, sequela, sequelae, sequelant, sequent, sequitur, stability, standing, steadfastness, subscript, suffix, supplement, survival, survivance, swan song, tag, timelessness, unceasingness