The Collaborative International Dictionary of English v.0.48:

Intermittence \In`ter*mit"tence\, n. [Cf. F. intermittence.]
   Act or state of intermitting; intermission. --Tyndall.
   [1913 Webster]

WordNet (r) 3.0 (2006):

intermittence
    n 1: the quality of being intermittent; subject to interruption
         or periodic stopping [syn: intermittence,
         intermittency]

Moby Thesaurus II by Grady Ward, 1.0:

108 Moby Thesaurus words for "intermittence":
   abeyance, alternation, arrhythmia, beat, break, broken thread,
   brokenness, caesura, capriciousness, cease-fire, choppiness,
   coffee break, cyclicalness, day off, desultoriness,
   disconnectedness, disconnection, discontinuance, discontinuation,
   discontinuity, discontinuousness, discreteness, disjunction,
   downtime, drop, eccentricity, episode, erraticness, fibrillation,
   fitfulness, fits and starts, fluctuation, half time,
   half-time intermission, hesitation, holiday, incoherence,
   incompleteness, inconstancy, interim, interlude, intermezzo,
   intermission, intermittency, interregnum, interruption, interval,
   irregularity, jerkiness, lapse, layoff, letup, lull, meter,
   non sequitur, noncontinuance, nonlinearity, nonseriality,
   nonuniformity, off-time, oscillation, parenthesis, patchiness,
   pause, pendulum motion, periodicalness, periodicity, piston motion,
   plateau, point of repose, pulsation, quiet spell, reappearance,
   recess, recurrence, regular wave motion, relief, remission,
   reoccurrence, respite, rest, resting point, return, rhythm,
   roughness, seasonality, spasticity, sporadicity, sporadicness,
   spottiness, stagger, stand-down, stay, suspension, time off,
   time out, truce, uncertainty, undulation, unevenness,
   unmethodicalness, unpredictability, unsteadiness, unsystematicness,
   vacation, variability, whimsicality, wobble