from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Psychology Characterized by a high degree of emotional responsiveness to the environment.
  • adj. Electricity Of or relating to two oscillating circuits having the same resonant frequency.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. In harmony or synergy with one's personality and milieu.
  • adj. Having the same frequency.

from the GNU version of the Collaborative International Dictionary of English

  • adj. 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.

from The Century Dictionary and Cyclopedia

  • Same as syntonous.
  • 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.


From Greek suntonos, high-strung, intense, attuned, from sunteinein, to draw tight : sun-, syn- + teinein, to stretch.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From German Syntonie ("syntony") +‎ -ic. (Wiktionary)



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