The Collaborative International Dictionary of English v.0.48:

Isochronize \I*soch"ro*nize\, v. t. [imp. & p. p. -nized; p.
   pr. & vb. n. -nizing.] [See Isochronous.]
   To make, or tend to make (the motion of a moving body),
   uniform in rate of rotation, or in frequency of vibration.
   [Webster 1913 Suppl.]