THESAURUS
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abide, adjourn, advance, be continuous, be prolonged, bide, carry on, carry over, carry through, catenate, cease not, chain, concatenate, connect, connect up, continuate, continue to be, dawdle, defeat time, defer, defy time, delay, drag on, drag out, draw, draw out, dwell, dwell on, elapse, elongate, endure, exist, expire, extend, flit, flow, flow on, fly, form a series, glide, go along, go by, go on, go on with, hang fire, hang up, hold, hold off, hold on, hold out, hold over, hold steady, hold up, jog on, join, keep, keep at, keep at it, keep driving, keep going, keep on, keep trying, keep up, lapse, last, last long, last out, lay aside, lay by, lay over, lengthen, lengthen out, let out, linger, linger on, link, live, live on, live through, maintain, maintain continuity, never cease, not accept compromise, occur often, outlast, outlive, pass, pass by, perdure, perennate, perpetuate, persevere, persist, persist in, pick up, pigeonhole, postpone, press on, prevail, proceed, proceed with, procrastinate, produce, prolong, prolongate, prorogate, prorogue, protract, pull, pursue, push aside, put aside, put off, put on ice, recess, recommence, recur, remain, renew, reopen, reserve, resume, ride, roll on, run, run its course, run on, run out, set aside, set by, shelve, shift off, sleep on, slide, slip, slog on, spin out, stagger on, stand, stand over, stave off, stay, stay on, strain, stretch, stretch out, string, string out, string together, subsist, survive, suspend, sustain, table, take a recess, take up, tarry, tauten, temporize, tense, thread, tide over, tighten, vibrate, waive, wear, wear well
ROGET THESAURUS
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Perseverance
VB
persevere, persist, hold on, hold out, die in the last ditch, be in at the death, stick to, cling to, adhere to, stick to one's text, keep on, keep to one's course, keep to one's ground, maintain one's course, maintain one's ground, go all lengths, go through fire and water, bear up, keep up, hold up, plod, stick to work, continue, follow up, die in harness, die at one's post.
Existence
VB
exist, be, have being, subsist, live, breathe, stand, obtain, be the case, occur, have place, prevail, find oneself, pass the time, vegetate, consist in, lie in, be comprised in, be contained in, be constituted by, come into existence, arise, come forth, become, bring into existence, abide, continue, endure, last, remain, stay.
Diuturnity
VB
last, endure, stand, remain, abide, continue, brave a thousand years, tarry, drag on, drag its slow length along, drag a lengthening chain, protract, prolong, spin out, eke out, draw out, lengthen out, temporize, gain time, make time, talk against time, outlast, outlive, survive, live to fight again.
Continuance in action
VB
continue, persist, go on, jog on, keep on, run on, hold on, abide, keep, pursue, stick to its course, take its course, maintain its course, carry on, keep up, sustain, uphold, hold up, keep on foot, follow up, perpetuate, maintain, preserve, harp upon, keep going, keep alive, keep the pot boiling, keep up the ball, keep up the good work, die in harness, die with one's boots on, hold on the even tenor of one's way, pursue the even tenor of one's way, let be, stare super antiquas vias, quieta non movere, let things take their course, stare decisis (Jurisprudence).