Source : Webster's Revised Unabridged Dictionary (1913)

Exist \Ex*ist"\, v. i. [imp. & p. p. {Existed}; p. pr. & vb. n.
   {Existing}.] [L. existere, exsistere, to step out or forth,
   emerge, appear, exist; ex out + sistere to cause to stand, to
   set, put, place, stand still, fr. stare to stand: cf. F.
   exister. See {Stand}.]
   1. To be as a fact and not as a mode; to have an actual or
      real being, whether material or spiritual.

            Who now, alas! no more is missed Than if he never
            did exist.                            --Swift.

            To conceive the world . . . to have existed from
            eternity.                             --South.

   2. To be manifest in any manner; to continue to be; as, great
      evils existed in his reign.

   3. To live; to have life or the functions of vitality; as,
      men can not exist water, nor fishes on land.

   Syn: See {Be}.

Source : WordNet®

exist
     v 1: have an existence, be extant; "Is there a God?" [syn: {be}]
     2: support oneself; "he could barely exist on such a low wage";
        "Can you live on $2000 a month in New York City?"; "Many
        people in the world have to subsist on $1 a day" [syn: {survive},
         {live}, {subsist}]