1) To make isochronal 
• (v. t.) To make, or tend to make (the motion of a moving body), uniform in rate of rotation, or in frequency of vibration.
I·soch'ro·nize transitive verb [ imperfect & past participle -nized ; present participle & verbal noun -nizing .] [ See Isochronous .] To make, or tend to make (the motion of a moving body), uniform in rate of rotation, or in freq...
to make isochronal.