resonance

共鳴、反響 ◇re(＝back) ＝響きわたること

(noun) The quality or condition of being resonant: words that had resonance throughout his life.
(noun) Richness or significance, especially in evoking an association or strong emotion: "It is home and family that give resonance . . . to life” ( George Gilder). "Israel, gateway to Mecca, is of course a land of religious resonance and geopolitical significance” ( James Wolcott).
(noun) Physics The increase in amplitude of oscillation of an electric or mechanical system exposed to a periodic force whose frequency is equal or very close to the natural undamped frequency of the system.
(noun) Physics A subatomic particle lasting too short a time to be observed directly. The existence of such particles is usually inferred from a peak in the energy distribution of its decay products.
(noun) Acoustics Intensification and prolongation of sound, especially of a musical tone, produced by sympathetic vibration.

Twitter will measure what it calls resonance, which takes into account nine factors, including the number of people who saw the post, the number of people who replied to it or passed it on to their followers, and the number of people who clicked on links.