• synonyms


  1. Electricity. adjusted to oscillations of the same or a particular frequency.
  2. Psychiatry. of or denoting a personality characterized by normal emotional responsiveness to the environment.
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Also syn·ton·i·cal, syntonous.

Origin of syntonic

1890–95; < Greek sýnton(os) attuned to, literally, stretched together (verbid of synteínein to harmonize, equivalent to syn- syn- + ton- (derivative of teínein to stretch; see tone) + -os adj. suffix) + -ic
Related formssyn·ton·i·cal·ly, adverbnon·syn·ton·ic, adjectivenon·syn·ton·i·cal, adjectivenon·syn·ton·i·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for syntonic

Historical Examples

  • Page 77, printer's error, systonic for syntonic, 'the systonic transmitting'.

    Hertzian Wave Wireless Telegraphy

    John Ambrose Fleming

British Dictionary definitions for syntonic


  1. psychol emotionally in harmony with one's environment
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Derived Formssyntonically, adverb

Word Origin

C20: from Greek suntonos in harmony with; see syn-, tone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

syntonic in Medicine


  1. Characterized by a normal emotional responsiveness to the environment.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.