The Collaborative International Dictionary of English v.0.48:

Concent \Con*cent"\, n. [L. concentus, fr. concinere to sing
   together; con- + canere to sing.]
   1. Concert of voices; concord of sounds; harmony; as, a
      concent of notes. [Archaic.] --Bacon.
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            That undisturbed song of pure concent. --Milton.
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   2. Consistency; accordance. [Obs.]
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            In concent to his own principles.     --Atterbury.
      [1913 Webster] Concenter