Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

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