In physics/chemistry, the phenomenon in which a system vibrates strongly at the same frequency as an external vibration or wave (resonance).
ガラスは特定の周波数で共鳴して割れることがある。
Glass can resonate at a certain frequency and shatter.
この回路は共鳴回路として設計されている。
This circuit is designed as a resonant circuit.
ギターのボディが弦の振動と共鳴して豊かな音が出る。
The guitar body resonates with the strings' vibration to produce a rich sound.
Figuratively, to feel sympathy with or to resonate emotionally/intellectually with someone else's idea or feeling.
彼の主張に多くの若者が共鳴した。
Many young people resonated with his argument.
その歌詞は私の経験に強く共鳴した。
The lyrics strongly resonated with my experience.
彼女のスピーチは観客の心に共鳴を呼んだ。
Her speech struck a chord with the audience.