The Collaborative International Dictionary of English v.0.48:

Survival \Sur*viv"al\, n. [From Survive.]
   1. A living or continuing longer than, or beyond the
      existence of, another person, thing, or event; an
      outliving.
      [1913 Webster]

   2. (Arhaeol. & Ethnol.) Any habit, usage, or belief,
      remaining from ancient times, the origin of which is often
      unknown, or imperfectly known.
      [1913 Webster]

            The close bearing of the doctrine of survival on the
            study of manners and customs.         --Tylor.
      [1913 Webster]

   Survival of the fittest. (Biol.) See Natural selection,
      under Natural.
      [1913 Webster] Survivance

WordNet (r) 3.0 (2006):

survival
    n 1: a state of surviving; remaining alive [syn: survival,
         endurance]
    2: a natural process resulting in the evolution of organisms
       best adapted to the environment [syn: survival, survival
       of the fittest, natural selection, selection]
    3: something that survives

Moby Thesaurus II by Grady Ward, 1.0:

91 Moby Thesaurus words for "survival":
   abidingness, afterglow, afterimage, age, ancient manuscript,
   antique, antiquity, archaism, artifact, balance, butt, butt end,
   candle ends, cave painting, chaff, constancy, continuance, debris,
   defeat of time, defiance of time, detritus, diuturnity, durability,
   durableness, duration, end, endurance, eolith, fag end, filings,
   fossil, holdover, husks, lastingness, leavings, leftovers,
   long standing, long-lastingness, long-livedness, longevity,
   maintenance, mezzolith, microlith, neolith, odds and ends,
   offscourings, orts, paleolith, parings, perdurability, perennation,
   permanence, perpetuity, persistence, petrification,
   petrified forest, petrified wood, petroglyph, plateaulith, rags,
   refuse, relic, relics, reliquiae, remainder, remains, remnant,
   residue, residuum, rest, roach, rubbish, ruin, ruins, rump,
   sawdust, scourings, scraps, shadow, shavings, stability, standing,
   steadfastness, straw, stubble, stump, survivance, sweepings, trace,
   vestige, waste