Resonance (physics)
Etymology
From Latin resonare, "to resound, echo back" (re-, "back," plus sonare, "to sound"). It began as a term about sound ringing in sympathy, then physics generalized it: every oscillating system has frequencies at which a small, well-timed input produces a big response. The metaphor of ideas that "resonate" carries the same logic.
noun · /REZ-uh-nunss/
The tendency of a system to respond with unusually large swings when it is driven at its own natural frequency.
What it names
Why a message, rhythm, or push that matches something already latent in a person or crowd lands far harder than its size would suggest.
Example
The speech resonated not because it was clever but because it named a frustration the whole room had been quietly carrying.
Related idea
Resonance is amplification by matching a system’s own rhythm; momentum is the tendency of a motion, once large, to keep going on its own.
noun · /REZ-uh-nunss/
The power of something to evoke deep, shared feelings, memories, or significance; also the rich, reverberating quality of a sound.
What it names
emotional or cultural depth — the way an image, phrase, or event “rings true” and lingers
Example
The old song held a resonance for everyone who had lived through that decade.
Related idea
Borrowed from the physics of sympathetic vibration: a story resonates when it strikes something already present in the listener and sets it humming — the felt cousin of natsukashii.