Definition: persistent

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Source: WordNet (r) 1.7 

persistent
     adj 1: never-ceasing; "the relentless beat of the drums" [syn: relentless,
             unrelenting]
     2: continually recurring to the mind; "haunting memories"; "the
        cathedral organ and the distant voices have a haunting
        beauty"- Claudia Cassidy [syn: haunting]
     3: (biology) retained; not shed; "persistent leaves remain
        attached past maturity"; "the persistent gills of fishes"
        [syn: lasting] [ant: caducous]

Source: Webster's Revised Unabridged Dictionary (1913) 

Persistent \Per*sist"ent\, a. [L. persistens, -entis, p. pr. of
   persistere. See Persist.]
   1. Inclined to persist; having staying qualities; tenacious
      of position or purpose.

   2. (Biol.) Remaining beyond the period when parts of the same
      kind sometimes fall off or are absorbed; permanent; as,
      persistent teeth or gills; a persistent calyx; -- opposed
      to deciduous, and caducous.

Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

persistent

   persistence