'Existing' definitions:

Definition of 'existing'

(from WordNet)
adjective
Presently existing; "the existing system"
adjective
Having existence or being or actuality; "an attempt to refine the existent machinery to make it more efficient"; "much of the beluga caviar existing in the world is found in the Soviet Union and Iran" [syn: existent, existing] [ant: nonexistent]
adjective
Existing in something specified; "depletion of the oxygen existing in the bloodstream"

Definition of 'Existing'

From: GCIDE
  • 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. [1913 Webster]
  • Who now, alas! no more is missed Than if he never did exist. --Swift. [1913 Webster]
  • To conceive the world . . . to have existed from eternity. --South. [1913 Webster]
  • 2. To be manifest in any manner; to continue to be; as, great evils existed in his reign. [1913 Webster]
  • 3. To live; to have life or the functions of vitality; as, men can not exist in water, nor fishes on land.
  • Syn: See Be. [1913 Webster]

Definition of 'existing'

From: GCIDE
  • existing \existing\ adj.
  • 1. having existence or being or actuality; as, much of the beluga caviar existing in the world is found in the Soviet Union and Iran. Opposite of nonexistent. [Narrower terms: active, alive; extant, surviving] Also See: extant.
  • Syn: existent. [WordNet 1.5]
  • 2. Present. Opposite of absent. [WordNet 1.5]
  • 3. Presently existing; as, the existing system. [WordNet 1.5]