The Collaborative International Dictionary of English v.0.48:

Recurrent \Re*cur"rent\ (-rent), a. [L. recurrens, -entis, p.
   pr. of recurrere: cf.F. r['e]current. See Recur.]
   1. Returning from time to time; recurring; as, recurrent
      pains.
      [1913 Webster]

   2. (Anat.) Running back toward its origin; as, a recurrent
      nerve or artery.
      [1913 Webster]

   Recurrent fever. (Med.) See Relapsing fever, under
      Relapsing.

   Recurrent pulse (Physiol.), the pulse beat which appears
      (when the radial artery is compressed at the wrist) on the
      distal side of the point of pressure through the arteries
      of the palm of the hand.

   Recurrent sensibility (Physiol.), the sensibility
      manifested by the anterior, or motor, roots of the spinal
      cord (their stimulation causing pain) owing to the
      presence of sensory fibers from the corresponding sensory
      or posterior roots.
      [1913 Webster]

WordNet (r) 3.0 (2006):

recurrent
    adj 1: recurring again and again; "perennial efforts to
           stipulate the requirements" [syn: perennial,
           recurrent, repeated]

Moby Thesaurus II by Grady Ward, 1.0:

112 Moby Thesaurus words for "recurrent":
   alternate, articulated, automatic, beaten, beating, catenated,
   ceaseless, circling, common, concatenated, connected, constant,
   continual, continued, continuing, continuous, cyclic, cyclical,
   direct, endless, epochal, even, ever-recurring, every other,
   everyday, featureless, frequent, frequentative, gapless, habitual,
   hackneyed, haunting, immediate, incessant, indelible, interminable,
   intermittent, isochronal, isochronous, iterative, joined,
   jointless, linked, many, many times, measured, metronomic,
   monotonous, nagging, never-ending, nonstop, not rare, obsessive,
   of common occurrence, oft-repeated, oftentime, ordinary,
   oscillatory, perennial, periodic, periodical, persistent,
   prevalent, pulsing, reappearing, reciprocal, recurring, regular,
   repeated, repetitious, repetitive, returning, revenant, rhythmic,
   rotary, round-the-clock, routine, running, seamless, seasonal,
   serial, serried, smooth, stable, steady, stereotyped, straight,
   thematic, thick-coming, trite, twenty-four-hour, ubiquitous,
   unbroken, unceasing, undifferentiated, undulant, undulatory,
   unending, unforgettable, uniform, unintermitted, unintermittent,
   unintermitting, uninterrupted, unrelieved, unremitting, unstopped,
   usual, wavelike, well-trodden, well-worn, wheeling