• Webster's Revised Unabridged Dictionary
    • a Syntonic (Physics) Of or pert. to syntony; specif., designating, or pert. to, a system of wireless telegraphy in which the transmitting and receiving apparatus are in syntony with, and only with, one another.
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Century Dictionary and Cyclopedia
    • syntonic Same as syntonous.
    • syntonic In electricity, swinging together, or in resonance with each other, as the sender and the receiver in selective wireless telegraphy; pertaining to, or exhibiting, syntonism.
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In literature:

Professor Braun's syntonic system, the receiver and transmitter of which have been described, is also in one form a non-earthed system.
"Hertzian Wave Wireless Telegraphy" by John Ambrose Fleming