1) To render syntonic 2) Tune to the same frequency 
• (v. t.) To adjust or devise so as to emit or respond to electric oscillations of a certain wave length; to tune; specif., to put (two or more instruments or systems of wireless telegraphy) in syntony with each other.
Syn'to·nize transitive verb [ imperfect & past participle -nized ; present participle & verbal noun -nizing .] [ See Syntony .] (Physics) To adjust or devise so as to emit or respond to electric oscillations of a certain wa...
syntonize, syntoknization To adjust or devise so as to emit or respond to electric oscillations of a certain wave length; to tune; specifically, to put (two or more instruments or systems of wireless telegraphy) in syntony with each other.
to render syntonic; tune to the same frequency.