(ˈ)sin.|tänik, sən.ˈt- adjective
Etymology: Greek synton os being in harmony with + English -ic
1. : possessing a temperament normally rsponsive and adaptive to one's social or interpersonal environment — compare cyclothymic
2. : of or relating to resonance ; especially : having the same resonant frequency
• syn·ton·i·cal·ly -änə̇k(ə)lē adverb