isochronize

from The American Heritage® Dictionary of the English Language, 5th Edition.

• transitive verb To make isochronal.

from The Century Dictionary.

• To cause to vibrate in equal times; adjust to equality, as to frequency (any periodic operations or cycles).

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To make, or tend to make (the motion of a moving body), uniform in rate of rotation, or in frequency of vibration.